Multi Tech Systems Fax Machine MT5600BA V92 NAM User Manual

MultiModem^®II

MT5600BA-V92

MT5600BR-V92

MT5656ZDX

MT5656ZDXV

AT Commands

Reference Guide

Table of Contents

Chapter 1 – Introduction..............................................................................................................................................4

Chapter 2 – AT Commands .........................................................................................................................................5

General Commands...................................................................................................................................................5

Escape Commands..................................................................................................................................................16

Modem Connection Commands...............................................................................................................................17

Caller ID Commands................................................................................................................................................19

Callback Security Commands ..................................................................................................................................19

Data Compression Commands ................................................................................................................................20

Error Control Commands .........................................................................................................................................21

DTE Commands.......................................................................................................................................................23

Modulation Command..............................................................................................................................................24

Call Control Command.............................................................................................................................................25

Test Command.........................................................................................................................................................27

Chapter 3 – Voice Commands...................................................................................................................................28

Voice Commands Overview.....................................................................................................................................28

Configuration Commands ........................................................................................................................................28

Voice Commands.....................................................................................................................................................30

Speakerphone Commands ......................................................................................................................................37

Unformatted Form Reporting – Caller ID..................................................................................................................38

Voice Mode Shielded Codes....................................................................................................................................38

Chapter 4 – V.8 / V.8bis Commands .........................................................................................................................40

Chapter 5 – V.25bis Commands................................................................................................................................41

V.25bis Responses ..................................................................................................................................................42

Chapter 6 – S-Registers.............................................................................................................................................43

S-Registers ..............................................................................................................................................................43

Chapter 7 – Result Codes..........................................................................................................................................46

Chapter 8 – Setting Country/Regional Codes..........................................................................................................51

Index............................................................................................................................................................................52

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Chapter 1 – Introduction

AT commands are used to control the operation of your modem. They are so called because each command must be

preceded by the characters AT to get the ATtention of the modem.

AT commands can be issued only when the modem is in command mode or online command mode.

•

The modem is in command mode whenever it is not connected to another modem.

The modem is in data mode whenever it is connected to another modem and ready to exchange data.

Online command mode is a temporary state in which you can issue commands to the modem while

connected to another modem.

To put the modem into online command mode from data mode, you must issue an escape sequence: Type +++ and

wait for the OK response. Then issue the hang-up command by typing ATH<CR>. <CR> indicates that you must

click Enter). To return to data mode from online command mode, type the command ATO.

To send AT commands to the modem you must use a communications program, such as PhoneTools, a

communications program included with your modem, or HyperTerminal in Windows 95, 98, NT 4.0, Me, 2000, XP.

You can issue commands to the modem either directly or by typing them in the terminal window of the

communications program. You issue them indirectly by configuring the operating system or communications program

to send the commands automatically. Fortunately, communications programs make daily operation of modems

effortless by hiding the commands from the user. Most users, therefore, need to use AT commands only when

reconfiguring the modem; e.g., to turn autoanswer on or off.

The format for entering an AT command is ATXn, where X is the command and n is the value for the command,

sometimes called the command parameter. The value is always a number. If the value is zero, you can omit it from

the command. Thus, AT&W is equivalent to AT&W0.

Most commands have a default value, which is the value that is set at the factory. Default values are provided with

each command in the AT Commands section.

You must press Enter to send the command to the modem.

Any time the modem receives a command, it sends a response known as a result code. The most common result

codes are OK, ERROR, and CONNECT. For a table of valid result codes, see the “Result Codes” sections of this

manual.

You can issue several commands in one line, in what is called a command string.

The command string begins with AT and ends when you press Enter. Spaces to separate the commands are

optional; they are ignored by the command interpreter. The most familiar command string is the initialization string,

which is used to configure the modem when it is turned on or reset, or when your communications software calls

another modem.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Chapter 2 – AT Commands

General Commands

Command:

Values:

AT Attention Code

n/a

Description:

The attention code precedes all command lines except A/ and the escape sequence.

Command:

Values:

Enter Key

Description:

Press the ENTER or RETURN key to execute most commands.

Command:

Values:

Answer

Description:

Answers an incoming call before the final ring.

Command:

Values:

Repeat Last Command

n/a

Description:

Repeats the last command string. Do not precede this command with AT. Do not press

ENTER to execute.

Command:

Values:

Default:

Bn Communication Standard Setting

n = 0 or 1

Description:

Selects ITU-T V.22 mode when the modem is at 300 or 1200 bps.

Selects Bell 212A when the modem is at 300 or 1200 bps.

Command:

Values:

Ds Dial

s = dial string (phone number and dial modifiers)

Default:

none

Description:

Dials telephone number s, where s may be up to 40 characters long and include the

following dial string modifiers.

0–9

Digits 0 through 9

The “star” digit (tone dialing only)

The “pound” digit (tone dialing only)

A–D

A, B, C, D tone digits. Country specific; some countries may prohibit these digits.

Redials last number. (Must be placed immediately after ATD.)

Selects pulse-dialing until a T is encountered. Affects current/subsequent dialing.

Select tone-dialing until a P is encountered. Affects current/subsequent dialing.

Wait for a new dial tone before continuing to dial.(X2 or X4 must be selected.)

Pause during dialing for time set in S-Register S8.

;

Return to command mode after dialing. (Place at end of dial string.)

Hook flash. Causes the modem to go quicking on-hook then back off-hook.

Wait for silence. Causes the modem to wait for 5 seconds of silence before

processing the next part of the command. If silence is not detected within the

time set in S-Register S7, the modem returns a NO ANSWER or BUSY code.

Toggle data calling tone on or off. Applies only to current dialing attempt.

Detect credit card “bong” tone. If the tone is not detected within the time specified

by S7 (US models), the modem aborts the rest of the sequence and hangs up.

The character should follow the phone number and precede the user’s calling

card number; e.g., ATDT1028806127853500&123456789.

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Chapter 2 – AT Commands

Command: DS=n Dial Stored Telephone Number

Values:

Default:

n = 0–3

none

Description:

Dials a number previously stored in directory number n by the &Zn=x command.

Example: ATDS=3.

Command:

Values:

Default:

En Echo Command Mode Characters

n = 0 or 1

Description:

Does not echo keyboard input to the terminal.

Does echo keyboard input to the terminal.

Command:

Values:

Default:

Hn Hook Control

n = 0 or 1

Description:

Goes on-hook (hang up) and terminate any &T test in progress.

Goes off-hook (make the phone line busy); enters command mode.

Command:

Values:

Default:

Information Request

n = 0–6

None

Description:

Displays the product code. Example: MT5600BA-V92.

Calculates ROM checksum; displays the least significant byte in decimal format.

Calculates ROM checksum and compares it to the prestored checksum, displays

OK if they match or ERROR if they don’t match.

Displays the firmware version and application codes.

Displays the OEM-defined identifier string in either binary or ASCII format.

Displays the regional or country code. Example: 098.

Displays the modem data pump model and internal code version.

Command:

Not applicable.

Command:

Value:

L5 Lists Current Operating Parameters

Default:

None

Description:

Displays the current values for the error correction, flow control, data compression, and

serial port speed commands. Example:

atL5

&E2 &E3 &E15 $SB115200

Note: Use the &V command to display the other parameters.

Command:

Values:

Default:

Mn Monitor Speaker Mode

n= 0, 1, 2, or 3

Description:

Speaker is always off.

Speaker is on until the carrier signal is detected.

Speaker is always on when the modem is off-hook.

Speaker is off when receiving carrier and during dialing, but on during answering.

Command:

Values:

Default:

On Return Online to Data Mode

0 or 1

None

Description:

Exit online command mode and return to online data mode without a retrain.

Normally used after a +++ escape (see +++ escape sequence).

Exit online command mode and return to online data mode after a retrain.

Command:

Values:

Pulse Dialing

P,T

Default:

Description:

Forces pulse (non-touch-tone) dialing until a T command or T dial modifier is received.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Chapter 2 – AT Commands

Command:

Values:

Default:

Qn Result Codes Enable/Disable

n = 0 or 1

Description:

Enables result codes.

Disables result codes

Command:

Values:

Default:

Select Register

r is the S-Register number

None

Description:

Selects register Sr as the last register accessed; e.g., S0. The command AT? can then be

used to read the register, and the command AT=n can then be used to set the register to

value n.

Command: Sr=n Set Register Value

Values:

r is the S-Register number; n varies

Default:

None

Description:

Sets value of register Sr to n, where n is entered in decimal format; e.g., S0=1.

If the short form AT=n is used, the value is written to the last accessed S-Register.

Command:

Values:

Sr? Read Register Value

r is the S-Register number

Default:

None

Description:

Reads value of register Sr and displays it in 3-digit decimal format. S2? gives the

response 043. If the short form AT? is used, the last accessed S-Register is read.

Command:

Values:

Tone Dialing

P,T

Default:

Description:

Forces DTMF (touch-tone) dialing until a P command or P dial modifier is received.

Command:

Values:

Default:

Vn Result Code Format

n = 0 or 1

Description:

Displays result codes as digits (terse response).

Displays result codes as words (verbose response)

Command:

Values:

Wn Connect Message Control

n = 0, 1, or2

Default:

Description:

W0 The CONNECT result code reports the serial port speed only.

W1 The CONNECT result code reports the line speed, the error correction protocol,

and the serial port speed, respectively.

W2 The CONNECT result code reports the line speed only.

Note: See also the \V command

Command:

Values:

Xn Result Code Selection

n = 0–4

Default:

Country Dependent

Description:

Selects the result message subset that the modem will use to inform the computer of the

results of commands.

Sends OK, CONNECT, RING, NO CARRIER, ERROR and NO ANSWER; does not

look for dial tone or busy signal.

Sends X0 messages and connect speed; doesn’t look for dial tone or busy signal.

Sends X1 messages with NO DIALTONE; does not look for busy signal.

Sends X1 messages with BUSY; does not look for dial tone.

Sends all messages, including NO DIALTONE and BUSY.

Note: In fax mode, the only message sent to indicate a connection is CONNECT without

a speed indication. See also the \V command.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Chapter 2 – AT Commands

Command:

Yn Long Space Disconnect

Note: For use with MT5600BA and MT5600BR only.

Values:

Default:

n = 0 or 1

Description:

Disables sending/responding to a long space break signal on disconnect.

Enables long space disconnect. In non-error correction mode, the modem sends a

long space of four seconds prior to going on-hook. In non-error correction mode,

the modem responds to the receipt of a long space (i.e., a break signal greater than

1.6 seconds) by going on-hook.

Command:

Values:

Zn Modem Reset

n = 0 or 1

Default:

None

Description:

The modem performs a soft reset and restores (recalls) the configuration profile according

to the parameter supplied. If no parameter is specified, zero is assumed.

Resets modem and restores Profile 0.

Resets modem and restores Profile 1.

Note: See also the &F and &W commands.

Command:

Values:

Default:

&Cn Data Carrier Detect (DCD) Control

n = 0 or 1 (all models) 2, 3, 4, 5, 6, 7 (MT5600BA and MT5600BR only)

1, 3, 4

Description:

&C0 Turns off reset on loss of carrier.

&C1 A second way to turn off reset on loss of carrier.

&C2 DCD goes high 500ms after CONNECT message is generated.

&C3 DCD goes high when the CONNECT message is generated.

&C4 Disables &C5 and &C6 commands.

&C5 UNIX only: Holds DCD low until proper callback security password is entered or

until a disconnect occurs. This prevents UNIX login prompt from being displayed

before the callback security ENTER PASSWORD prompt appears.

&C6 Linux only: Waits to display the connect message until the proper callback security

password is entered.

&C7 Resets on loss of DCD.

Command:

Values:

&Dn Data Terminal Ready (DTR) Control

n = 0, 1, 2, or3

Default:

Description:

This command interprets the high to low transition of the DTR signal sent by the computer

according to the supplied parameter. The action taken depends on the current &Q setting.

&D0 &Q0, &Q5,&Q6: DTR is ignored (assumed high). Allows operation with computers

that do not provide DTR.

&Q1: DTR drop causes the modem to hang up. Autoanswer is not affected.

&Q2,&Q3: DTR drop causes the modem to hang up. Autoanswer is inhibited.

&D1 &Q0, &Q1, &Q5,&Q6: DTR drop is interpreted by the modem as if the

asynchronous escape sequence had been entered. The modem returns to

asynchronous command state without disconnecting.

&Q2,&Q3: DTR drop causes the modem to hang up. Autoanswer is inhibited.

&D2 &Q0–&Q6: DTR drop causes the modem to hang up. Autoanswer is inhibited.

&D3 &Q0, &Q1, &Q5,&Q6: DTR drop causes modem to perform a soft reset as if the Z

command were received. The &Y setting determines which profile is loaded.

&Q2,&Q3: DTR drop causes the modem to hang up. Autoanswer is inhibited.

&Q5 or &Q6 and +FCLASS=1 or +FCLASS=2: Same as for &Q0.

Note: If &D1, &D2,or &D3 is set, the modem will not dial without a DTR drop.

Command:

&En V.42 Error Correction Modes

Note: For use with MT5600BA and MT5600BR only.

n = 0, 1, or 2

Values:

Default:

Description:

&E0 V.42 non-error correction mode (V.42 disabled).

&E1 V.42 auto-reliable mode.

&E2 V.42 reliable mode (V.42 enabled).

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Chapter 2 – AT Commands

Command:

&En Modem-Initiated Flow Control

Note: For use with MT5600BA and MT5600BR only.

n = 3, 4, or 5

Values:

Default:

Description:

&E3 Flow control disabled.

&E4 CTS/RTS hardware flow control.

Note: See also the L5 and &K commands.

Command:

&En V.42bis Data Compression

Note: For use with MT5600BA and MT5600BR only.

n = 14 or 15

Values:

Default:

Description:

&E14 V.42bis data compression disabled.

&E15 V.42bis data compression enabled.

Note: This command controls only V.42bis data compression, whereas the %C command

controls both V.42bis and MNP-5 data compression. The command in effect is the

one last entered. See also the L5 command.

Command:

Values:

&Fn Load Factory Settings

n = 0 or 1

Default:

None

Description:

&F0 Loads factory configuration 0.

&F1 Loads factory configuration 1.

Note: See also the Z, L5, and &V commands.

Command:

Values:

&Gn V.22bis Guard Tone Control

n = 0, 1, or2

Default:

Varies by country

Description:

&G0 Disables guard tone.

&G1 Sets guard tone to 550 Hz.

&G2 Sets guard tone to 1800 Hz.

Note: The &G command is not used in North America, and may not be permitted in some

countries.

Command:

Values:

&Kn Flow Control Selection

n = 0, 3, 4, 5, or6

Defaults:

3 (data modem mode)

6 (fax modem and voice modes)

Description:

&K0 Disables flow control.

&K3 Enables CTS/RTS hardware flow control.

&K4 Enables XON/XOFF software flow control.

&K5 Enables transparent XON/XOFF flow control.

&K6 Enables both CTS/RTS and XON/XOFF flow control.

Note: See also the &E command

Command:

Values:

&Mn Communications Mode

n = 0–3

Default:

Description:

This command determines the DTR operating mode. The modem treats the &M command

as a subset of the &Q command.

&M0 Selects direct asynchronous operation. Command sequence &M0\N0 selects

normal buffered mode, but command sequence \N0&M0 selects direct mode. This

is because the \N0 command is analogous to the &Q6 command.

&M1 Selects synchronous connect mode with asynchronous offline command mode.

&M2 Note: For use with the MT5656ZDX and MT5656ZDX-V only. Selects synchronous

connect mode with asynchronous offline command mode.

Same as &M1 except that &M2 enables DTR dialing of directory slot 0. The modem

disconnects if DTR is low for more than the period stored in S25.

&M3 Selects synchronous connect mode. This mode allows DTR to act as a talk/data

switch. A call is manually initiated while DTR is inactive; when it becomes active,

the handshake proceeds in originate or answer mode according to S14 bit 7.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Chapter 2 – AT Commands

Command:

Values:

&Pn Make/Break Dial Ratio

n = 0, 1, 2,3

Default:

Varies by country/region

Description:

&P0 Make/Break dial ratio of 39/61 at 10 pps

&P1 Make/Break dial ratio of 33/67 at 10 pps

&P2 Make/Break dial ratio of 39/61 at 20 pps

&P3 Make/Break dial ratio of 33/67 at 20 pps

Command:

Values:

Default:

&Qn Sync/Async Mode

n =0-3, 5, 6

Description:

This command is an extension of &M and is used to control which connection modes are

permitted. It is used in conjunction with S36 and S48. (See also the \N command.)

&Q0 Selects direct asynchronous operation. See &M0.

&Q1 Selects synchronous connect mode with asynchronous offline command mode.

See &M1. Serial interface operation only.

&Q2 Selects synchronous connect mode with asynchronous offline command mode;

enables DTR dialing of directory 0. See &M2. Serial interface only.

&Q3 Selects synchronous connect mode with asynchronous offline command mode;

enables DTR to act as a talk/data switch. See &M3. Serial only.

&Q5 The modem will try to negotiate an error-corrected link. It can be configured using

S36 to determine whether a failure will result in disconnecting or falling back to a

non-error-correction connection. See also \N3.

&Q6 Selects asynchronous operation with speed buffering and no error correction.

Same as \N0.

Command:

Values:

&Rn Clear to Send (CTS) Control

n = 0 or 1

Default:

Description:

&R0 Lets the CTS state follow the RTS state when online..

&R1 Forces CTS high (ON).

Note: This command applies only in synchronous mode.

Command:

Values:

&Sn Data Set Ready (DSR) Control

n = 0 or 1

Default:

Description:

&S0 Forces DSR high (on) at all times.

&S1 Lets DSR go high only during a connection.

Command:

Values:

&Tn Local Analog Loopback Test

n = 0,1

Default:

None

Description:

The modem will perform the local analog loopback test if &T1 is selected. The test can be

run only when the modem is in asynchronous operation in non-error-correction mode

(normal), AT&Q6. To terminate a test in progress, the escape sequence (+++) must be

entered first.

&T0 Terminates any test in progress. Clears S16.

&T1 Starts local analog loopback, V.54 Loop 3. Sets S16 bit 0. If a connection exists

when this command is issued, the modem hangs up. A CONNECT XXXX message

is displayed at the start of the test.

Command:

Values:

&Vn Display Current Configuration and Statistics for Last Connection

0,1

Default:

None

Description:

&V0 Displays the current (active) configuration.&V1 Displays statistics for the last

connection. Not available in all versions. Note: See also the L5 command. (L5 is not

supported in MT5656ZDX).

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

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Command: &Wn Store Current Configuration

Values:

Default:

n= 0 or 1

None

Description:

&W0 Stores current modem settings in nonvolatile memory as Profile 0. Profile 0 is

loaded instead of the factory defaults at power-on (if &Y0 is set) and by the ATZ

command.

&W1 Stores current modem settings in nonvolatile memory as Profile 1. Profile 1 is

loaded instead of the factory defaults at power-on (if &Y1 is set) and by the ATZ1

command.

Note: See also the Z, &F, and &Y commands.

Command: &Xn

Synchronous Clock Source

Note: For use with MT5600BA and MT5600BR only.

n= 0, 1, or 2

alues:

Default:

Description:

Selects the source of the transmit clock for synchronous mode. In asynchronous mode,

the transmit and receive clocks are turned off. In synchronous mode, the clocks are turned

on with a frequency of 1200 Hz or faster corresponding to the speed selected for modem

operation.

Note: Synchronous Online (&M1) must be enabled before you can set the synchronous

clock.

&X0 Selects internal timing. The modem generates the transmit clock signal and applies

it to the TXCLK output at the serial interface.

&X1 Selects external timing. The local DTE sources the transmit clock signal on the

XTCLK input of the serial interface. The modem applies this clock to the TXCLK

output at the serial interface.

&X2 Selects slave receive timing. The modem derives the transmit clock signal from the

incoming carrier and applies it to the TXCLK output at the serial interface.

Command:

Values:

&Yn Select Profile for Hard Reset

n = 0 or 1

Default:

None

Description:

&Y0 Select profile 0 to be loaded on power-up.

&Y1 Select profile 1 to be loaded on power-up.

Note: See also the &W and Z commands.

Command: &Zn=x Store Telephone Number

Values:

n = 0–3 (with callback security disabled)

&Z3 is the phone memory location for leased-line dial back up number (not for the

MT5656ZDX and the MT5656ZDX-V).

n = 0-29 (with callback security enabled – for a future release)

x = Stored telephone number

Default:

None

Description:

Stores telephone dial string x in memory location.

&Z3 is the phone memory location for leased-line dial back up number.

Dial the stored number using the ATDS=n command.

Note: See also the #CBSn command.

Command: %Cn Data Compression Control

Values:

n = 0, 1, 2, or 3

Default:

Description:

Enables or disables data compression negotiation. The modem can only perform data

compression on an error-corrected link.

%C0 Disables data compression.

%C1 Enables MNP 5 data compression negotiation.

%C2 Enables V.42bis data compression negotiation.

%C3 Enables both V.42bis and MNP 5 data compression negotiation.

Note: This command controls both V.42bis and MNP-5 data compression, whereas the

&E14 and &E15 commands control only V.42bis data compression. The command

in effect is the one last entered.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Chapter 2 – AT Commands

Command: %En Line Quality Monitor

Values:

Default:

n = 0, 1, or 2

Description:

Controls whether or not the modem will automatically monitor the line quality and request

a retrain (%E1) or fall back to a lower speed when line quality is insufficient and fall

forward to a faster speed when line quality is sufficient (%E2).

%E0

%E1

%E2

Disables line quality monitor and auto-retrain.

Enables line quality monitor and auto-retrain.

Enables line quality monitor and fallback/fall forward.

Command:

Values:

%L Line Signal Level

None

Default:

None

Description:

% L Returns a value that indicates the received signal level in dBm. This value is a direct

indication (DAA-dependent) of the receive level at the MDP, not at the telephone line

connector. Examples: 009 = -9 dBm, 043 = -43 dBm, and so on.

Command:

Values:

%Q Line Signal Quality

None

Default:

None

Description:

% Q reports line signal quality (DAA-dependent) as a three-digit number. Returns the

higher order byte of the EQM value. Based on the EQM value, retrain or fallback/fall

forward may be initiated if enabled by %E1 or %E2.

Command:

Values:

%U PCM Code Selection

n = 0 or 1

Default:

Description:

Specifies the PCM code type for 56K modulation. Note, however, that the modem

automatically selects the code type if the server sends the proper ID.

%U0

%U1

Selects µ-Law coding—used in North America and Japan.

Selects A-Law coding—used outside North America and Japan.

Note: See also the +MS= command.

Command:

\An Maximum MNP Block Size

Note: For use with MT5600BA and MT5600BR only.

Values:

Default:

n= 0, 1, 2, or 3

Description:

\A0

\A1

\A2

\A3

64-character maximum block size.

128-character maximum block size.

192-character maximum block size.

256-character maximum block size.

Command:

Values:

\Bn Transmit Break

n = 0–9 in 100 ms units

Default:

Description:

In non-error-correction mode only, sends a break signal of the specified length to a remote

modem. Works in conjunction with the \K command.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

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Command: \Kn

Values:

Default:

Break Control

n = 0–5

Description:

Controls the response of the modem to a break received from the computer, the remote

modem, or the \B command. The response is different for each of three different states.

Data mode. The modem receives the break from the computer:

\K0

\K1

\K2

\K3

\K4

\K5

Enter online command mode; no break sent to the remote modem.

Clear data buffers and send break to the remote modem.

Same as \K0.

Send break immediately to the remote modem .

Same as \K0.

Send break to the remote modem in sequence with the transmitted data.

Data mode. The modem receives the break from the remote modem during a non-error-

corrected connection:

\K0

\K1

\K2

\K3

\K4

\K5

Clear data buffers and send break to the computer.

Same as \K0.

Send break immediately to the computer.

Same as \K2.

Send break to the computer in sequence with the received data.

Same as \K4.

Online command mode. The modem receives a \Bn command from the computer:

\K0

\K1

\K2

\K3

\K4

Clear data buffers and send break to the remote modem.

Same as \K0.

Send break immediately to the remote modem.

Same as \K2.

Send break to the remote modem in sequence with the transmitted data.

Same as \K4.

Command:

Values:

Default:

\Nn Error Correction Mode Selection

n = 0–5

Description:

\N0

\N1

\N2

Normal (non-error correction) mode with data buffering. Forces &Q6.

Direct mode. Equivalent of &M0 and &Q0 modes. Forces &Q0.

V.42/MNP reliable (error-correction) mode. Modem attempts first a V.42

connection and then an MNP connection. Failure to make a reliable connection

results in the modem hanging up. Forces &Q5, S36=4, and S48=7.

V.42/MNP auto-reliable mode. Modem attempts first to connect in V.42 mode,

then in MNP mode, and finally in non-error-correction mode with data buffering.

Forces &Q5, S36=7, and S48=7.

\N3

\N4

\N5

V.42 (LAPM) reliable mode. If modem cannot make a V.42 connection, it

disconnects. Forces &Q5 and S48=0. Note: -K1 can override \N4.

MNP reliable mode. If the modem cannot make an MNP connection, it

disconnects. Forces &Q5, S36=4, and S48=128.

Command:

Values:

Default:

\Vn Single Line Connect Message

n = 0 or 1

Description:

\V0

Disables single line connect message. CONNECT messages are controlled by

the X, W, and S95 settings.

\V1

Enables single line CONNECT. Formatted: CONNECT <Serial PortSpeed>

</Modulation></Protocol></Compression></Line Speed>/<Voice and Data>.

Overrides X, W, and S95 commands. CONNECT messages display in the single

line format subject to V and Q. In non-verbose mode (V0), single line CONNECT

messages are disabled and a single numeric result code is generated.

Command: +FCLASS= Display Current Fax Class

Values:

0, 1, 2, 8

Default:

None

Description:

Data

Fax – Class 1, Class 1.0

Fax – Class 2, 2.0, 2.1

Voice Commands

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Command:

Description:

+GCI Country/Region of Installation

This extended syntax command selects and indicates the region/country of installation for

the modem. The parameter selects the settings for any operational parameters that need

to be adjusted for national regulations or telephone networks.

Syntax: +GCI=<region_code>Defined Values: <region_code>Example: Euro/Nam = B5.

For a list of regions/countries approvals and codes, see the Multi-Tech Web site at:

http://www.multitech.com/PRODUCTS/Info/approvals

Default:

If the modem is specified for use in only one country, the country code is the default.

Otherwise, the default is defined by the OEM. The factory default is B5.

Report Commands:

+GCI?

Reports current or selected values.

+GCI=? Reports supported range of parameter values.

Command: +MS= Modulation Selection

Values & Default:

Description:

See description.

This extended-format command selects modulation and, optionally, enables or disables

automode, specifies the lowest and highest connection rates, selects µ-Law or A-Law

codec type, and specifies the highest transmit rate using one to five subparameters.

The command format is:

+MS=[+MS=[<carrier>[,<automode>[,<min_TX_rate>[,<max_TX_rate>[,min_RX_rate>[,<max_RX_rate>]]]]]]

Subparameters that are not entered retain their current value. Commas separate optional

subparameters and should be inserted to skip a subparameter. Example: +MS=,0,<CR>

disables automode and keeps all other settings at their current values.

Subparameters:

mod – A decimal number that specifies the preferred modulation (automode enabled) or

the modulation to use in originating or answering a connection (auto-mode disabled).

+MS Command Supported Rates

Modulation <carrier> Possible (<min_rx_rate>,<max_rx_rate>,(<min_tx_rate>), and

<max_tx_rate>) Rates (bps)

Bell 103

Bell 212

V.21

B103

B212

V21

300

1200 Rx/75 Tx or 75 Rx/1200 Tx

300

V.22

V22

1200

V.22 bis

V.23

V.32

V22B

V23C

V32

2400 or 1200

1200

9600 or 4800

V.32 bis

V.34

V32B

V34

14400, 12000, 9600, 7200, or 4800

33600, 31200, 28800, 26400, 24000, 21600, 19200, 16800, 14400,

12000, 9600, 7200, 4800, or 2400

V.90

V90

56000, 54667, 53333, 52000, 50667, 49333, 48000, 46667, 45333,

44000, 42667, 41333, 40000, 38667, 37333, 36000, 34667, 33333,

32000, 30667, 29333, 28000

V.92 downstream V92

V.92 upstream V92

same as V.90 above

48000, 46667, 45333, 44000, 42667, 41333, 40000, 38667, 37333,

36000, 34667, 33333, 32000, 30667, 29333, 28000, 26667, 25333,

24000

Note: Some <carrier> values may not be supported by certain model models.

automode – An optional numeric value that enables or disables automatic modulation

negotiation using V.8bis/V.8 or V.32bis Annex A. The options are:

0 = Disables automode

1 = Enables automode (default)

<min_rx_rate> and <max_rx_rate>

Numeric values which specify the lowest (<min_rx_rate>) and highest

(<max_rx_rate>) rate at which the modem may establish a receive connection. May

be used to condition distinct limits for the receive direction as distinct from the

transmit direction. Values for this subparameter are decimal encoded, in units of bit/s.

The possible values for each modulation are listed in the table above. Actual values

will be limited to possible values corresponding to the entered <carrier> and fall-back

<carrier> as determined during operation. (Default = lowest (<min_rx_rate>) and

highest (<max_rx_rate>) rate supported by the selected carrier.)

<min_tx_rate> and <max_tx_rate>

Numeric values which specify the lowest (<min_tx_rate>) and highest

(<max_tx_rate>) rate at which the modem may establish a transmit connection. Non-

zero values for this subparameter are decimal encoded, in units of bit/s. The possible

values for each modulation are listed in the table above. Actual values will be limited

to possible values corresponding to the entered <carrier> and fall-back <carrier> as

determined during operation. (Default = lowest (<min_tx_rate>) and highest

(<max_tx_rate>) rate supported by the selected carrier.)

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Command: -Kn

Values:

Default:

MNP Extended Services

n = 0, 1, or 2

Description:

Enables or disables conversion of a V.42 LAPM connection to an MNP 10 connection.

-K0

-K1

-K2

Disables V.42 LAPM to MNP 10 conversion.

Enables V.42 LAPM to MNP 10 conversion.

Enables V.42 LAPM to MNP 10 conversion; inhibits MNP Extended Services

initiation during V.42 LAPM answer mode detection phase.

Command: **

Values:

Flash Memory Download

n = 0, 1, or 2

Description:

**0

**1

**2

Initiates download to flash memory at the last sensed speed.

Initiates download to flash memory at 38.4K bps.

Initiates download to flash memory at 57.6K bps.

Command: *B

Values:

View Numbers in Blacklist

n/a

Description:

If blacklisting is in effect, AT*B displays a list of numbers for which the last call attempted

in the previous two hours failed. Permanently forbidden numbers as defined by country

requirements do not appear in this list. If no numbers are blacklisted, only the OK result

code is displayed.

Command: *D

Values:

View Delayed Numbers

n/a

Description:

AT*D displays a list of delayed numbers, as defined in the *B command, together with

their delay times. If no numbers are delayed, only the OK result code is displayed.

Command: $Dn DTR Dialing

Notes: Use this command for the MT5600BR only.

To set DTR Dialing for the MT5600BA, use the LCD display panel on the modem.

See the MT5600BA User Guide for LCD display panel directions.

Values:

n = 0 or 1

Default:

Description:

The modem dials the number stored in the phone number location &Z0 with $D1 set when

the modem receives a high DTR signal.

$D0

$D1

Disables DTR dialing.

Enables DTR dialing.

Command: $Cn Key Abort

Values:

Default:

0, 1

Description:

Key abort will work for both orignate and answer. The value can be stored.

$C0

$C1

Disables key abort.

Enables key abort.

Command: $SBn Serial Port Baud Rate

Note: Use this command with MT5600BA and MT5600BR only.

n = speed in bits per second

Values:

Default:

57600

Description:

$SB300

$SB1200

$SB2400

$SB4800

$SB9600

Sets serial port to 300 bps.

Sets serial port to 1200 bps.

Sets serial port to 2400 bps.

Sets serial port to 4800 bps.

Sets serial port to 9600 bps.

$SB19200 Sets serial port to 19200 bps.

$SB38400 Sets serial port to 38400 bps.

$SB57600 Sets serial port to 57600 bps.

$SB115200 Sets serial port to 115200 bps.

Note: See also the L5 command.

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Escape Commands

Command: +++

Escape Sequence

Type +++ and wait for OK response.

Then issue the hang-up command by typing ATH <CR>. (<CR> indicates that you must

click Enter).

Values:

n/a

Description:

Puts the modem in online command mode.

Command: *E

Escape Remote Configuration

Note: Use with MT5600BA and MT5600BR only.

n/a

Values:

Description:

Escape Remote Configure Sequence. The remote modem configuration escape command

is defined in S-Register S13.

Notes: The Escape Remote Configuation command (*E) must be issued while online

with the remote modem.

Remote Configuration is initiated by using the command: ***

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Chapter 2 – AT Commands

Modem Connection Commands

Command: +PCW=n Call Waiting Enable

Values:

Default:

n = 0, 1, or 2

Description:

Controls the action to be taken upon detection of a call waiting tone in V.92 mode.

Values specified by this command are not modified when an AT&F command is issued.

+PCW=0 Toggles V.24 Circuit 125 and collects Caller ID if enabled by +VCID.

+PCW=1 Hangs up.

+PCW=2 Ignores V.92 call waiting.

+PCW=? Displays the allowed values.

+PCW?

Displays the currrent values.

Command: +PIG=n PCM Upstream Ignore

Values:

n = 0 or 1

Default:

Description:

Controls the use of PCM upstream during V.92 operation. PCM upstream allows faster

upload speeds to a V.92 server.

+PIG=0

+PIG=1

+PIG=?

+PIG?

Disables PCM upstream.

Enables PCM upstream.

Displays the allowed values.

Displays the current values.

Command: +PQC=n Quick Connect Control

Values:

n = 0, 1, 2, or 3

Default:

Description:

Controls the V.92 shortened Phase 1 and Phase 2 startup procedures (Quick Connect).

When line conditions are stable, quick connect results in shortened connect times;

however, significant fluctuations in line conditions from call to call can result in longer

connect times, in which case it may be advisable to disable quick connect.

+PQC=0 Enables Short Phase 1 and Short Phase 2 (Quick Connect).

+PQC=1 Enables Short Phase 1.

+PQC=2 Enables Short Phase 2.

+PQC=3 Disables Short Phase 1 and Short Phase 2.

+PQC=? Displays the allowed values.

+PQC?

Displays the current values.

Command: +PSS

Description:

Use Short Sequence

This command causes a calling modem to force either a V.92 short or full startup

sequence as defined by the +PQC command on the next and subsequent connections.

Syntax: +PSS=<value>

Values:

<value> Decimal number corresponding to the selected sequence.

The modems decide whether or not to use the short startup procedures.

The short startup procedures can only be used if enabled by the +PQC

command. Default

Reserved.

Forces the use of the full startup procedures on the next and subsequent

connections independent of the setting of the +PQC command.

Result Codes:

OK 0 - 2 in V.92 Mode (+MS=V.92)

ERROR Otherwise

Report Commands:

+PSS? Reports selected values.

+PSS=? Reports supported range of parameter values.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

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Command: -QCPC Force Full Startup Procedure Next Connection

Description:

This command causes the modem to use full startup procedures on the next connection

attempt regardless of the setting of the +PQC command. After this attempt, the modem

will select the startup procedure as defined by the +PQC command. If a shortened

startup procedure is enabled by +PQC, then the quick connect profile will also be

updated on the next connection attempt.

Syntax: -QCPC

Result Code:

ERROR Otherwise

Command: -QCPS Enable Quick Connect Profile Save

Description:

This command controls whether or not the modem will save the generated quick

connect profile.

Syntax: -QCPS=<value>

Values:

0, 1

<value> Decimal number corresponding to the desired operation.

Do not allow the quick connect profile to be saved.

Allow the quick connect profile to be saved. Default

Result Codes:

OK 0 or 1 in V.92 Mode (+MS=V.92) and quick connect is enabled (+PSS = 0)

ERROR Otherwise

Report Commands:

-QCPS? Reports selected value

-QCPS=? Reports supported range of parameter values

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Chapter 2 – AT Commands

Caller ID Commands

Command: +VCID=n Caller ID Selection

Values:

Default:

n = 0, 1, or 2

Description:

Enables Caller ID detection and configures the reporting and presentation of the Caller

ID data that is detected after the first ring. The reported data includes the date and time

of the call, the caller's name and number, and a message. Set S0=2.

+VCID=0 Disables Caller ID.

+VCID=1 Enables Caller ID with formatted data.

+VCID=2 Enables Caller ID with unformatted data.

+VCID=? Displays the allowed values.

+VCID? Displays the current values.

Command: +VRID= Caller ID Report Retrieved

Values:

0, 1

Default:

Description:

This command reports the data associated with the Caller ID services in the Incoming

Call Line ID (ICLID) data format for the last received call.

+VRID=0 Reports Caller ID with formatted presentation to the DTE. Data includes

date, time, name, and telephone number.

+VRID=1 Reports Caller ID with unformatted presentation to the DTE.

+VRID=? Displays the supported range of parameter values.

+VRID

Displays Caller ID information of the last call received.

Callback Security Commands

Note: Callback Security Commands apply to the MT5600BA and MT5600 BR only.

Command: #CBNn=[-]x Store Callback Number

Values:

n = 01–30x = dialing string

Default:

None

Description:

Stores the callback dialing string x in a memory location. The dialing string can

include the digits 0 through 9 and any of the following characters:

#, *, comma (,), semicolon (;), W, A, B, C, and D.

Up to 30 characters can be used.

Example:AT#CBN01=9,16127853000.

If the optional - character precedes the dialing string, and the caller appends the

same character to the password, the caller is immediately connected.

Command: #CBPn=x Store Callback Password

Values:

n = 01–30

x = password (6–10 characters)

Default:

None

Description:

Stores callback security password x in memory location y. The password must have 6

to 10 characters. Example: AT#CBP01=gilamep.

Note: A direct connect password may not end with a hyphen (-).

Command: #DBn Callback Enable/Disable

Values:

n = 0 or 1

Default:

Description:

Enables or disables callback security. When callback security is enabled, phone number

memory locations 0–4, used for quick dialing and DTR dialing, become unavailable and

are replaced by callback security memory locations 1–30. The phone number memory

locations and their contents are restored when callback security is disabled.

#DB0 Disables callback security.

#DB1 Enables callback security.

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Chapter 2 – AT Commands

Data Compression Commands

Command:

+DR Data Compression Reporting

Values:

0, 1

Default:

Description:

This extended-format numeric parameter controls whether or not the extended-format

+DR: intermediate result code is transmitted from the modem to the DTE. S95 bit 5 is

reset to 0 for +DR=0 and is set to a 1 for +DR=1. The more recent setting of +DR or S95

bit 5, and the W command setting, determines the actual data compression result code

reporting (see S95 Parameter and W Command).

+DR0 Data compression reporting disabled (no +DR result code transmitted).

+DR1 Data compression reporting enabled (+DR result code transmitted). (Default.)

+DR:

<type> Intermediate Result Code. The +DR: <type> reported represents the

current (negotiated or renegotiated) modem-modem data compression type. If

enabled, the intermediate result code is transmitted at the point after error control

negotiation (handshaking) at which the modem has determined which data

compression technique will be used (if any) and the direction of operation. The

+DR intermediate result code, if enabled, is issued after the Error Control Report

(+ER) and before the final result code (e.g., CONNECT).

Report Commands:

+DR? Reports current or selected values.

+DR=? Reports supported range of parameter values.

Command:

Values:

+DS Data Compression

Specifies the desired direction(s) of operation of the data compression

function; from the DTE point of view.

+DS0 Negotiated; no compression (V.42bis P0=0).

+DS3 Both directions, accept any direction (V.42bis P0=11).

<compr_neg> Specifies whether or not the modem should continue to operate if the

desired result is not obtained.

+DS0 Do not disconnect if V.42bis is not negotiated by the remote

modem as specified in <direction>.

<max_dict>

Specifies maximum number of dictionary entries (2048 entries) that should

be negotiated (may be used by the DTE to limit the code word size

transmitted, based on its knowledge of the data to be transmitted).

<max_string> Specifies max string length (32 bytes) to be negotiated (V.42bis P2).

Default:

Description:

This extended-format compound parameter controls the V.42bis data compression

function if provided in the modem. It accepts four numeric subparameters:

+DS=[<direction>[,<compr_neg>[,<max_dict>[,<max_string>]]]]

Report Commands:

+DS?

Reports current or selected values.

+DS=?

Reports supported range of parameter values.

Command: +DS44 V.44 Compression Select

Description:

Values:

This extended-format compound parameter controls V.44 data compression function.

<direction> The decimal number that specifies the desired direction(s) of operation of

the data compression function; from the DTE point of view.

Negotiated, no compression.

Transmit only.

Receive only.

Both directions, accept any direction. Default

<compress_negotiation> The decimal number that specifies whether or not the modem

should continue to operate if the desired result is not obtained.

Do not disconnect if V.44 is not negotiated by the remote DCE as

specified in <direction>. Default

Disconnect if V.44 is not negotiated by remote DCE as specified in

<direction>.

<capability> The decimal number that specifies the use of stream method, packet

method, multi-packet method.

Stream method. Default

Packet method.

Multi-packet method.

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<max_codewords_tx> The decimal number from 256 to 2048 that specifies the

maximum number of code words which should be negotiated in the transmit

direction. Default = 2048

<max_codewords_rx> The decimal number from 256 to 2048 that specifies the

maximum number of code words which should be negotiated in the receive

direction. Default = 2048

<max_string_tx> The decimal number from 32 to 255 (maximum string length).

Error Control Commands

Command: +EB Break Handling in Error Control Operation

Description:

This extended-format compound parameter controls the break handling in V.42 operation.

It accepts three numeric subparameters:

+EB=[<break_selection>[,<timed>[,<default_length>]]]

<break_seleIction> Decimal number 0 specifying that break is to be ignored; i.e., not

signaled to remote DCE.

Subparameters:

<timed>

Decimal number 0 specifying that any transmitted V.42 L-SIGNAL

will not indicate break signal length.

<default_length>

+EB?

Decimal number 0 specifying that break is not delivered to the DTE.

Reports current or selected values.

Report Commands:

+EB=?

Reports supported range of parameter values.

Command: +EFCS 32-bit Frame Check Sequence

Description:

This extended-format numeric parameter controls the use of the 16-bit or 32-bit frame

check sequence (FCS) option in V.42.

Values:

<value>

+EFCS?

+EFCS=?

Decimal number 0 specifying the use of the 16-bit FCS specified in V.42.

Reports current or selected values.

Reports supported range of parameter values.

Command: +ER Error Control Reporting

Description:

This extended-format numeric parameter controls whether or not the intermediate result

code is transmitted from the modem to the DTE.

S95 bit 3 is reset to 0 for +ER=0 and is set to a 1 for +ER=1. The more recent setting

of+ER or S95 bit 3, and the W command setting, determines the actual error control result

code reporting (see S95 Parameter and W Command).

0, 1

Values:

0 = Error control reporting disabled (no +ER intermediate result code transmitted).

1 = Error control reporting enabled (+ER intermediate result code transmitted).

Default:

Report Commands:

+ER?

Reports current or selected values.

+ER=?

Reports supported range of parameter values.

Command: +ES Error Control Selection

Description:

This extended-format command specifies the initial requested mode of operation when the

modem is operating as the originator, optionally specifies the acceptable fallback mode of

operation when the modem is operating as the originator, and optionally specifies the

acceptable fallback mode of operation when the modem is operating as the answerer.

It accepts three numeric subparameters:

+ES=[<orig_rqst>[,<orig_fbk>[,<ans_fbk>]]]

Subparameters:

<orig_rqst> Decimal number which specifies the initial requested mode of operation

when the modem is operating as the originator. The options are:

Initiate call with Direct Mode.

Initiate call with Normal Mode (also referred to as Buffered Mode) only.

Initiate V.42 without Detection Phase. If V.8 is in use, disable V.42

Detection Phase.

Initiate V.42 with Detection Phase. Default

Initiate MNP.

Initiate Frame Tunneling Mode when connection is complete and Data

Mode is entered.

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<orig_fbk> Decimal number which specifies the acceptable fallback mode of operation

when the modem is operating as the originator.

LAPM, MNP, or Normal Mode error control optional. Default

LAPM, MNP, or Direct Mode error control optional.

LAPM or MNP error control required; disconnect if error control is not

established.

LAPM error control required; disconnect if error control is not

established.

MNP error control required; disconnect if error control is not established.

<ans_fbk> Decimal number which specifies the acceptable fallback mode of operation

when the modem is operating as the answerer.

Direct Mode.

Error control disabled, use Normal Mode.

LAPM, MNP, or Normal Mode error control optional. Default

LAPM, MNP, or Direct Mode error control optional.

LAPM or MNP error control required; disconnect if error control is not

established.

LAPM error control required; disconnect if error control is not

established.

MNP error control required; disconnect if error control is not established.

Report Commands:

+ES?

Reports current or selected values.

+ES=? Reports supported range of parameter values.

Command: +ESR Selective Reject

Description:

This extended-format numeric parameter controls the use of the selective reject (SREJ)

option in V.42.

Syntax: +ESR=[<value>]

Decimal number 0 specifying that SREJ is not used.

Report Commands:

+ESR?

Reports current or selected values.

+ESR=? Reports supported range of parameter values.

Command: +ETBM Call Termination Buffer Management

Description:

This extended-format compound parameter controls the handling of data remaining in

modem buffers upon call termination. It accepts three numeric subparameters:

Syntax: +ETBM=[<pending_TD>[,<pending_RD>[,<timer>]]]

Values:

<pending_TD> Decimal number 0 specifying that disconnect will occur immediately and all

buffered transmit data will be discarded when the local DTE requests call disconnection.

<pending_RD> Decimal number 0 specifying that disconnect will occur immediately and

all buffered receive data will be discarded when the local DTE requests call disconnection.

<timer> Decimal number 0 specifying that the modem will not attempt to deliver the

buffered data before abandoning the attempt and discarding remaining data.

Report Commands:

+ETBM?

Reports current or selected values.

+ETBM=? Reports supported range of parameter values.

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DTE Commands

Command:

Description:

+IFC DTE-Modem Local Flow Control

This extended-format compound parameter controls the operation of local flow control

between the DTE and the modem during the data state when V.42 error control is used or

when fallback to non-error control mode is specified to include buffering and flow control. It

accepts two numeric subparameters.

Syntax: +IFC=[<modem_by_DTE>[,<DTE_by_modem>]]

<modem_by_DTE> Specifies method DTE will use to control flow of received data from

the modem.

Values:

0None.

XON/XOFF on transmitted data; do not pass XON/XOFF

characters to remote modem.

Circuit 133 (RR). Default

DC1/DC3 on circuit 103 (TD) with DC1/DC3 characters

being passed through to the remote DCE in addition to being

acted upon for local flow control.

<DTE_by_modem> Specifies method modem will use to control flow of transmitted data

from the DTE.

None.

XON/XOFF on received data.

CTS/RTS. Default

Report Commands:

+IFC? Reports current or selected values.

+IFC=? Reports supported range of parameter values.

Command: +ILRR DTE-Modem Local Rate Reporting

Description:

This extended-format numeric parameter controls whether or not the +ILRR:<rate>

information text is transmitted from the modem to the DTE.

Syntax: +ILRR=<value>

Values:

<value> Decimal number corresponding to the selected option.

Disables reporting of local port rate (+ILRR: is not transmitted). Default

Enables reporting of local port rate (+ILRR: is transmitted).

Report Commands:

Reported Rate:

+ILRR?

Reports current or selected values.

+ILRR=? Reports supported range of parameter values.

The <rate> reported is the current (negotiated or renegotiated) DTE-modem rate. If

enabled, intermediate result code is transmitted after any modulation, error control or data

compression reports are transmitted and before any final result code is transmitted. The

<rate> is applied after the final result code is transmitted. The DTE-modem port rate

changes only if neither buffered mode nor error controlled means are enabled (+ES=x,0)

and if the negotiated carrier rate (+MRR) does not match the current DTE-modem port

rate (auto detected from previous command line).

Syntax: +ILRR: <rate>[,<rx_rate>].

Reported Rate Values:

<rate>

Decimal value representing the current (negotiated or renegotiated)

DTE-modem rate: 0, 300, 1200, 2400, 4800, 9600, 19200, 38400,

57600, 115200, 230400

<rx_rate>

Optional decimal value reporting the RXD rate, if it is different from the

TXD rate: 0,300, 1200, 2400, 4800, 9600, 19200, 38400, 57600,

115200, or 230400

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Command: +IPR Fixed DTE Rate

Description:

This numeric extended-format parameter specifies the data rate at which the modem will

accept commands during online operation. It may be used to select operation at rates at

which the modem is not capable of automatically detecting the data rate being used by the

DTE.

Specifying a value of 0 disables the function and allows operation only at rates

automatically detectable by the modem. The specified rate takes effect following any

issued result code(s) associated with the current command line.

The <rate> specified does not apply in OnLine Data State if Normal Mode (Direct Mode) of

operation is selected.

Syntax: +IPR=<rate>

Values:

<rate> Specifies the DTE-modem interface operation rate in bits/s. The available rates

are: 0, 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, or 230400.

If unspecified or set to 0, automatic detection is selected and the character format is also

forced to auto detect. +ICF=0.

If the specified rate is not supported by the modem, an ERROR result will be returned.

+IPR? Reports current or selected values.

Report Commands:

+IPR=? Reports supported range of parameter values.

Modulation Command

Command: +MR Modulation Reporting Control

Description:

This extended-format numeric parameter controls whether or not the extended-format

+MCR:<carrier> and +MRR:<rate> intermediate result codes are transmitted from the

modem to the DTE. If enabled, +MCR:<carrier> and +MRR:<rate> intermediate result

codes represent the current (negotiated or renegotiated) modulation <carrier> and <rate>

that are transmitted at the point during connect negotiation (handshaking) at which the

modem has determined which modulation and rate will be used; i.e., before any Error

Control or Data Compression reports are transmitted and before any final result code

(e.g., CONNECT) is transmitted.

S95 bit 2 is reset to 0 for +MR=0 and is set to a 1 for +MR=1 or +MR=2. The more recent

setting of +MR or S95 bit 2 and the W command setting determines modulation result

code reporting (see S95 Parameter and W Command).

Syntax: +MR=[<value>]

Values:

<value> A decimal number corresponding to the selected option:

Disables reporting of modulation connection (+MCR: and +MRR: are not

transmitted). Default

Enables reporting of modulation connection (+MCR: and +MRR: are

transmitted with tx rate, rx rate).

Enables reporting of modulation connection (+MCR: and +MRR: are

transmitted with rx rate only).

Report Commands:

+MR?

Reports current or selected values.

+MR=?

Reports supported range of parameter values.

+MCR: Report Syntax: Response: +MCR: <carrier>

<carrier> Alphanumeric code corresponding to the reported carrier.

Defined values are:

B103 for Bell 103

B212 for Bell 212

V21 for V.21

V22 for V.22

V22B for V.22bis

V23C for V.23

V32 for V.32

V32B for V.32bis

V34 for V.34

V90 for V.90

V92 for V.92

+MRR: Report Syntax: Response: +MRR: <tx_rate>,<rx_rate>

<tx_rate>

<rx_rate>

Decimal transmit rate in bits/s.

Decimal receive rate in bits/s.

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Chapter 2 – AT Commands

Call Control Command

Command: -STE= Set Telephony Extension

Description:

This command enables/disables Line-In-Use, Extension Pickup, and Remote Hang up

detection features.

Note: Additional hardware may be required to support these features.

Syntax: -STE=<value>

Values:

<value> Decimal number corresponding to the selected bit-mapped options.

The bit fields are defined as follows:

Bit 0

Bit 1

Bit 2

Line-In-Use detection – enable/disable.

Extension Pickup – detection enable/disable.

Remote Hang up – detection enable/disable.

<value> (decimal)

0 (default)

Remote Hangup

Disabled

Enabled

Extension Pickup

Disabled

Enabled

Disabled

Enabled

Line-in-Use

Disabled

Enabled

Disabled

Enabled

Disabled

Enabled

Disabled

Enabled

Report Commands:

Result Codes:

-STE? Reports current or selected values

-STE=? Reports supported range of parameter values

OK <value> = 0-7

ERROR Otherwise.

Behavior in Data Mode (+FCLASS=0):

When on-hook, if the line is in use and an ATDT is issued, the modem will not go off-hook

and will return with the message LINE-IN-USE.

When off-hook and either an extension is picked up or a line reversal is detected, the

modem will drop the connection. The disconnect reason in register S86=25 (also defined

for #UD). The user must flash the hook in order to get a dial tone because the remote

server will be retraining.

If local handset is picked up while modem is off-hook, modem will do a link-disconnect,

flash the hook for 1.5 seconds, then connect local handset to the line. Now, the user dial

tone is on the local handset. Disconnect reason S86=25.

Behavior in Voice Mode (+FCLASS=8):

When in voice mode and an extension is picked-up, a <DLE>P is sent to the DTE. When

the modem is off-hook, a line reversal may also be detected in which case a <DLE>l is

sent to the DTE.

In voice mode, there is no blocking of ATDT when the line is in use. Also, there is no

automatic hang-up in voice mode as in data mode. There is only the above stated <DLE>

shielding event reporting.

Operation in Data Mode: Line-In-Use (Enabled by AT-STE=1, AT-STE=3, AT-STE=5, or AT-STE=7)

Case 1: Telephone Line is in Use

If an ATDT, ATDP or ATDL is issued while Line-In-Use detection is enabled and the

telephone line is in use, the modem will immediately return the message LINE-IN-USE to

the DTE without going off-hook, and then return to command mode.

Case 2: Telephone Line is in Use But Disconnected

If an ATDT, ATDP or ATDL is issued while Line-In-Use detection is enabled and the

telephone line is NOT in use, the modem will go off-hook after a short pause, then

respond with CONNECT or NO CARRIER message.

Case 3: Telephone Line is Not Connected to Modem

If an ATDT, ATDP or ATDL is issued while Line-In-Use detection is enabled and the

telephone line is not connected, the modem will go off-hook momentarily, go back on-

hook, then respond with NO DIAL TONE message.

Extension Pick-up (Enabled by AT-STE=2, AT-STE=3, AT-STE=6, or AT-STE=7):

Case 1: Modem off-hook, Local Handset Goes Off-Hook

If the local handset goes off-hook while the modem is in a data connection, the modem

will then send a GSTN Clear down to the remote modem and then go on-hook. The

modem will then send a NO CARRIER message to the DTE. A result code of 25 will be

left in S86 register.

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Chapter 2 – AT Commands

Remote Hang-up (enabled by AT-STE=4, AT-STE=5, AT-STE=6, or AT-STE=7):

Case 1: Modem off-hook, Remote Hang-up

If the modem is connected (off-hook) and the remote modem/server goes hangs up, the

central office may issue a line polarity reversal. If a line polarity reversal is detected, the

modem will drop the call and respond with NO CARRIER. The reason for hang-up can be

determined by #UD or by S86=25. A line reversal can also be simulated by simply pulling

out the telephone line during a connection.

Operation in Voice Mode:Line-In-Use (enabled by AT-STE=1, AT-STE=3, AT-STE=5, or AT-STE=7):

This feature does not apply in voice mode.

Extension Pickup (Enabled by AT-STE=2, AT-STE=3, AT-STE=6, or AT-STE=7)

If the modem is off-hook and an extension goes off-hook, the modem issues a <DLE>P to

the DTE. The application software then hangs up the line (VLS=0).

Remote Hang-up (Enabled by AT-STE=4, AT-STE=5, AT-STE=6, or AT-STE=7).

If the modem is off-hook and the remote user goes on-hook, the modem issues a <DLE>P

to the DTE. The application software then hangs up the line (VLS=0).

Examples:

User is talking on an extension and the modem tries to dial

AT-STE=7

ATDT555-1212

LINE-IN-USE.

The line is not in use and the modem tries to dial

AT-STE=7

ATDT555-1212

Modem goes off-hook

CONNECT

An extension is off-hook but there is silence on the line and the modem tries to dial

AT-STE=3

ATDT555-1212

Modem goes off-hook

NO DIAL TONE

Modem is connected in data mode and remote modem goes on-hook

AT-STE=4

ATDT555-1212

CONNECT

NO CARRIER Remote modem drops line

ATS86=?

025

Modem is in answer machine mode and an extension goes off-hook

AT-STE=2

AT+FCLASS=8

<DLE>h Local handset on-hook

<DLE>R Ring

AT+VLS=1

AT+VSM=1,8000

AT+VTX Starts to play greeting message

<DLE>P User picks up extension

<DLE>! DTE send abort to end playback

AT+VLS=0 DTE hangs up.

Continued on next page.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Chapter 2 – AT Commands

Automated system that needs to periodically use the line while giving the voice

user the highest priority

A common use for these features: An automated system that needs to periodically use the

line while giving the voice user the highest priority. The automated system makes a

connection when the line is free. It does this without disturbing the line if the line is in use.

The automated system periodically retries the connection until the line is free.

Once free, it dials and makes its connection. If a voice user wishes to use the line while

the modem is connected. the modem drops the line and gives it to the user. The modem

will then try to regain control of the line by once again periodically retrying to establish a

connection.

AT-STE=7

ATDT5551212

CONNECT

Sometime later, the user picks up phone

NO CARRIER

ATS86?

Delay 30 seconds

ATDT5551212

LINE-IN-USE

Try again some time later user hangs up the phone

CONNECT

Test Command

Command: &Tn

Values:

V.54 Test Command

n = 0, 1, 8

Default:

None

Description:

The modem can perform selected test and diagnostic functions. A test can be run only

when the modem is in asynchronous operation in non-error-correction mode (normal or

direct mode). To terminate a test in progress, the escape sequence (+++) must be entered

first.

&T0 Abort. Stop any test in progress.

&T1 Start local analog loopback, V.54 Loop 3. If a connection exists when this

command is issued, the modem hangs up. A CONNECT message is displayed at

the start of the test.

&T8 Starts local analog loopback, V.54 Loop 3, with self-test. If a connection exists, the

modem hangs up before the test begins. When the test is terminated, the number

of detected errors is reported to the computer.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Chapter 3 – Voice Commands

Note: Voice commands apply to the MT5656ZDX-V only.

Voice Commands Overview

Non-Voice Commands For Configuring the Voice Function

+FCLASS

+VCID

+VNH

Set Mode

Caller ID

Automatic Hang-up Control

Flow Control

+FLO

Voice Commands

+VIP

+VRX

+VTS

+VTX

+VGR

+VGT

+VIT

+VLS

+VRA

Description

Voice Initialize All Parameters

Start modem Receive (Record)

Voice Tone Send (Send single frequency or DTMF)

Start modem Transmit (Playback)

Voice Gain Receive (Record Gain)

Voice Gain Transmit (Playback Volume)

Voice Inactivity Timer (DTE/Modem)

Analog Source/Destination Selection

Ringback Goes Away Timer

Ringback Never Appeared Timer

Silence Detection (QUIET & SILENCE)

Compression Method Selection

Beep Tone Duration Timer

+VRN

+VSD

+VSM

+VTD

+VDR

Distinctive Ring

+VDT

+VPR

Command

+VSP

Control Tone Cadence Reporting

Select DTE/modem Interface Rate (Turn off autobaud)

Speakerphone

Speakerphone ON/OFF

+VDX

+VGM

+VGS

Speakerphone Duplex Mode

Microphone Gain

Speaker Gain

Configuration Commands

These configuration commands must be set before using the Voice Commands.

Command: +FCLASS=8 Select Voice Mode

+FCLASS=8 selects the Voice Mode. The Voice Mode commands and responses described in this

section are applicable when command +FCLASS=8. (See the Generic Modem Control section for

the definition of the FCLASS command.)

Command: +VCID Caller ID

See +VCID for Caller ID in Chapter 2.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Chapter 3 – Voice Commands

Command: +VNH= Automatic Hang-up Control

Description:

This command enables or disables automatic hang ups.

Syntax: +VNH=<hook>

<hook> Decimal number corresponding to the selected option.

Values:

Modem enables automatic hang ups as is normal in other modes.

Modem disables automatic hang ups usually found in the other non-

voice modes.

The modem disables automatic hang ups in the other non-voice modes.

The modem performs a “logical” hang up (returns OK result code).

Default:

Report Commands:

+VNH?

Reports current or selected values.

+VNH=? Reports supported range of parameter values.

Command Responses:

Automatice Hang-up Command Responses

Command

+VNH=0

+VNH=1

+VNH=2

Notes:

No Carrier Present

ATH

ATZ

DTR & D2

Y = will hang up; N = will not hang up

How +VNH is reset:

DTE uses +VNH command to change the setting.

DTE issues another +FCLASS mode change without issuing another +VNH.

A hang-up event occurs (see this table).

DTE issues +VIP command.

Command: +FLO

Function:

Flow Control

Select Flow Control Method

Values:

0, 1, 2, 3-255

Result Codes:

Description:

OK or ERROR

The +FLO? command lets you select the method of flow control provided and used by the

modem. If +FLO=0, some other method (such as credit flow control) is used. The Xon-Xoff

method is required. Xon is the ASCII character <DC1> (11 hex). Xoff is the ASCII

character >DC3> (13 hex). CCITT V.24 circuits 106 and 133 are optional flow control

methods. If circuits 106 and 133 are not used (+FLO<>2), then circuit 106 is held On

whenever +FCLASS=8.

In Voice mode, circuit 105 has no effect on the state of transmitted data. (Circuit 133

normally reverts to use as circuit 105 (RTS) when not used for Flow Control.)

+FLO=0

+FLO=1

+FLO=2

Disables Xon-Xoff and 133/105 flow control

Enables Xon-Xoff flow control in either direction

Enables CCITT Circuit 133 for flow control of the modem by the PC; use

CCITT Circuit 106 for flow control of the PC by the modem.

+FLO=3-255 Reserved for future standards.

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Chapter 3 – Voice Commands

Voice Commands

These commands are listed in the order in which they might be used.

Command: +VIP

Description:

Voice Initialize All Parameters

This command causes the modem to initialize all voice parameters to their default values.

Syntax: +VIP

Default:

None

Result Code:

ERROR If not in Voice Mode.

Command: +VRX Start Modem Receive (Record)

Description:

This command causes the modem to start the voice reception process.

Syntax: +VRX

Default:

None

Result Codes:

ERROR If not in Voice Mode.

Command: +VTS

Description:

Send Voice Tone(s)

This command causes the modem to send DTMF digit or hookflash tones with the

duration specified by +VTD, to send DTMF digit or hookflash tones with duration specified

by +VTS, or to send single or dual tone frequencies with duration specified by +VTS.

Syntax: +VTS=<string>

Default:

Values:

See the highlighted text for a discussion of defaults.

The tone generation consists of elements in a list where each element is

separated by a comma. Each element can be:

•

A single character which the modem interprets as a DTMF digit (0 - 9,

#, *, or A-D) or hookflash (!), with a duration given by +VTD.

A 3-element string enclosed in square brackets, “[freq1,freq2,dur]”,

which the modem interprets as a general dual tone and duration

selection, or

•

A 2-element string enclosed in curly braces, “{X,dur}”, which the

modem interprets as a DTMF digit (0 - 9, #, *, or A-D), or hookflash (!)

with a duration (dur) different than that given by the +VTD command.

Missing subparameters assume the default value. Unspecified values

always default to zero for frequencies, DTMF * for DTMF tones, and

+VTD for duration. The omission of commas (and associated

subparameters) is valid.

The quantity in the square brackets consists of a 3-element list

(freq1,freq2,dur), which can be used to send single or dual tones.

•

The first element is the first frequency (freq1) with range 0 or 200-3000

Hz.

The second element is the second frequency (freq2) with range 0 or

200-3000 Hz.

The third element is the duration (dur) in 0.01 second intervals with

range 0-255 (ASCII units of 10 ms).

A list may contain null elements. For example, [3000] means that the DCE

generates a single tone at 3000 Hz for the default duration, [3000,3300]

means that the DCE generates a dual tone at 3000 and 3300 Hz for

the default duration, and [,3300] means that the DCE generates a

single tone at 3300 Hz for the default duration.

The quantity in the curly braces consists of a 2-element list (X,dur), which

can be used to send DTMF tones or hookflash. The first element is the

DTMF tone or hookflash (!) character (X), and the second element is the

duration (dur) in 0.01 seconds. The characters are of the same set given

above. A list may contain null elements. For example, {2} means DTMF

tone 2 for the default duration and { } means silence for the default

duration.

The modem will stop the tone generation at the point in the string where

the modem detects a parsing error or encounters an invalid frequency

range, a <CR>, or a semicolon.

Report Command:

+VTS=? Reports supported range of parameter values.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Chapter 3 – Voice Commands

+VTS Examples:

Example 1

This example illustrates tone generation without using any null elements.

The command example is followed by a description of command execution.

AT+VTS= {!,30},1,2,[1000,1300,50],!,{*,6},[800,1300,50],9

1. Hookflash with a duration of 300 ms.

2. Play DTMF 1 with a duration given by the +VTD command.

3. Play DTMF 2 with a duration given by the +VTD command.

4. Play tone pair at 1 000 Hz and 1 300 Hz with a duration of 500 ms.

5. Hookflash with a duration given by the +VTD command.

6. Play DTMF * with a duration of 60 ms.

7. Play tone pair at 800 Hz and 1300 Hz with a duration of 500 ms.

8. Play DTMF 9 with a duration given by the +VTD command.

Example 2

This example illustrates tone generation using null elements.

The command example is followed by a description of command execution.

AT+VTS=1,2,[1000,1300,50],[800],9

1. Play DTMF 1 with a duration given by the +VTD command.

2. Play DTMF 2 with a duration given by the +VTD command.

3. Play tone pair at 1000 Hz and 1300 Hz with a duration of 500 ms.

4. Play tone pair at 800 Hz with a duration given by the +VTD command.

5. Play DTMF 9 with a duration given by the +VTD command.

Example 3

This example illustrates tone generation using null elements and periods of silence.

The command example is followed by a description of command execution.

AT+VTS=1,[,,50],2,[ ],9

1. Play DTMF 1 with a duration given by the +VTD command.

2. Play silence with a duration of 500 ms.

3. Play DTMF 2 with a duration given by the +VTD command.

4. Play silence with a duration given by the +VTD command.

5. Play DTMF 9 with a duration given by the +VTD command.

Command +VTX Start Modem Transmit (Playback)

Description:

This command causes the modem to start the voice transmission process.

Syntax: +VTX

Default:

None

Result Codes:

CONNECT. The modem accepts the command.

ERROR. The modem is not connected to at least one off-hook telephone line or one non-

telephone line.

Command: +VGR Voice Gain Receive (Record Gain)

Description:

This command causes the modem to set the gain for received voice samples.

Syntax: +VGR=<gain> 0 (only valid number) selects automatic gain control.

Default:

Result Codes:

OK <gain> = 0.

ERROR. Otherwise, or if not in Voice Mode.

Report Commands:

+VGR?

Reports current or selected values.

+VGR=?

Reports supported range of parameter values.

Command: +VGT Voice Gain Transmit (Playback Volume)

Description:

This command causes the modem to set the volume level.

Syntax: +VGT=<level>.

Values:

Default:

<level>

128

Decimal number corresponding to the volume level. Range = 0-255.

Report Commands:

+VGT?

+VGT=?

Reports current of selected values.

Reports supported range of parameter values.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Chapter 3 – Voice Commands

Command: +VIT

Description:

Voice Inactivity Timer (DTE/Modem)

This command sets the modem’s initial value for the DTE/modem inactivity timer.

Syntax: +VIT=<timer>

Values:

<timer>

Decimal number corresponding to the time in units of 1.0 second.

A value of 0 disables the timer. Range = 0-255.

Default:

Report Commands:

+VIT?

+VIT=?

Reports current of selected values.

Reports supported range of parameter values.

Command: +VLS

Description:

Analog Source/Destination Selection

This command causes the modem to select one or more source/destinations of the analog

data.

Syntax: +VLS=<label>

Values:

<label>

Decimal number corresponding to the selected analog source/destination

hardware configuration.

Default:

Report Commands:

+VLS?

+VLS=?

Reports current of selected values.

Reports supported range of parameter values.

Report Query Response: <label>,<devices>,<transmit event>,<receive

event>,<idle event>

Where each event subparameter is a hex number the represents an event

bit field of the reporting capabilities of each state. (See the Table Command

Options on the next page):

<label>

Identifies the modem analog source/destination hardware

configuration.

A <string constant> made up of Primitives.

<xxxx event> <transmit event>, <receive event>, and <idle

event>subparameters are the DCE event reporting

capabilities for the Voice Transmit State, Voice Receive

State, and the Voice Command State, respectively. Each

of the event reporting subparameters is a hex number that

represents an event bit field. The hex number format is

defined in Table 5-6); a one in the bit field indicates that

the DCE can report the associated event.

Each of the possible hardware configurations has its own <label>, ..., <idle

event> description line (the above form description shows just one). A

<CR><LF> terminates each description line.

+VLS Example:

AT+VLS=?

0,””,B0804100,B0804100,B0804100

1,”T”,0B8433C1,0FE431C1,0B8431C1

2,”L”,08800300,0CE00100,08800100

3,”LT”,0B8433C1,0FE431C1,0B8431C1

4,”S”,00800300,04E00100,20800100

5,”ST”,0B8433C1,0FE431C1,0B8431C1

8,”S1",00800300, 04E00100,20800100

9,”S1T”,0B8433C1,0FE431C1,0B8431C1

11,”M1",00800300,04E00100,20800100

14,”H”,00800300,04E00100,20800100

18,”M1S”,00800300,04E00100,20800100

19,”M1S1",00800300,04E00100,20800100

OK <label> = 0-5,8-9,11,14,18-19.

Result Codes:

ERROR The <label> value is out of range, or if the modem cannot service the request in

the <label> subparameter.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Chapter 3 – Voice Commands

Table of +VLS Command Options

Label Primitives Description

+VTX +VRX +VSP=1

None

DCE on-hook. Local phone connected to the line.

DCE off-hook. DCE connected to the line. Local phone provided with

power to detect hook condition.

DCE on-hook. Local phone connected to the DCE.

DCE off-hook. Local phone connected to the line.

DCE connected to the line.

Internal Speaker connected to the DCE. DCE on-hook.

Local phone connected to the line.

Internal Speaker connected to the line. DCE off-hook. DCE connected X

to the line. Local phone provided with power to detect hook condition.

Internal Microphone connected to the DCE. DCE on-hook.

Local phone connected to the line.

Internal Microphone and Internal Speaker connected to the line. DCE

off-hook. DCE connected to the line. Local phone provided with

power to detect hook condition.

External Speaker connected to the DCE. DCE on-hook. Local phone

connected to the line.

External Speaker connected to the line. DCE off-hook.

DCE connected to the line. Local phone provided with power to

detect hook condition.

Internal microphone and External Speaker connected to the line. DCE

off-hook. DCE connected to the line.

Local phone provided with power to detect hook condition.

External Microphone connected to the DCE. DCE on-hook.

Local phone connected to the line.

External Microphone and Internal Speaker connected to the line.

DCE off-hook. DCE connected to the line. Local phone provided with

power to detect hook condition.

External Microphone and External Speaker connected to the line.

DCE off-hook. DCE connected to the line. Local phone provided with

power to detect hook condition.

External Microphone and Speaker combination (handset or headset)

connected to the DCE. DCE on-hook.

Local phone connected to the line.

External Microphone and Speaker combination (handset or headset)

connected to the line. DCE off-hook. DCE connected to the line. Local

phone provided with power to detect hook condition.

MS Internal Microphone and Internal Speaker connected to DCE.

MS1 Internal Microphone and External Speaker connected to DCE.

External Microphone and Internal Speaker connected to DCE.

External Microphone and External Speaker connected to DCE.

MST

S1T

MS1T

M1ST

M1S1T

M1S

MS1

M1S1

Primitives (Column 2):

Local Phone.

Telephone Line.

Internal Microphone.

M1 External Microphone.

Internal Speaker.

S1 External Speaker.

External Microphone and Speaker combination (handset or headset).

Note: All label options in this table may not be supported by the product; see +VLS command

Command: +VRA Ringback Goes Away Timer

Description:

This command sets the length of time the modem will wait between ringbacks during call

origination before the modem can assume that the remote station has gone off-hook.

Syntax: +VRA=<interval>r r

Values:

<interval> Decimal number (0-255) specifying the silence interval time in units of 0.10

second between the end of one ring interval and the start of the next ring

interval. A value of 0 forces the modem to report the OK result code

immediately after the first Ringback. Range is 0.1 to 25.5 seconds for

<interval> = 1 to 255.

Default:

Interval of 50 (5 seconds)

Report Commands:

+VRA?

Reports current of selected values.

+VRA=?

Reports supported range of parameter values.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Chapter 3 – Voice Commands

Command: +VRN Ringback Never Appeared Timer

Description:

This command sets the length of time the modem will wait between ringbacks during call

origination before the modem can assume that the remote station has gone off-hook.

Syntax: +VRN=<interval>

Values:

<interval> Decimal number specifying the time period, in units of 1.0 second, that the

modem will wait for Ringback during call origination.

A value of 0 forces the modem to report the OK result code immediately

after dialing.

The range is 1 to 25 seconds for <interval> = 1 to 25.

Interval of 10 (10 seconds)

Default:

Result Codes:

OK <interval> = 0-25

ERROR Otherwise, or if not in Voice Mode.

Report Commands:

+VRN?

Reports current of selected values.

+VRN=?

Reports supported range of parameter values.

Command: +VSD Silence Detection (Quiet and Silence)

Description:

This command causes the modem to set the silence detection sensitivity and the required

period of silence before the modem reports silence detected at the end of a voice receive

either with the “Presumed End of Message” (QUIT) or “Presumed Hangup (SILENCE)

event reports.

Syntax: +VSD=<sds>,<sdi>

Values:

<sds>

Decimal number corresponding to the selected parameter.

Use +VSM silence compression setting and algorithm for long-term

silence detection (if +VSM is in use) or proprietary silence

compression setting and algorithm for long-term silence detection (if

+VSM is not in use).

127 Sets less aggressive long-term silence detection independent of

presence or use of silence compression.

128 Sets nominal long-term silence detection independent of presence or

use of silence compression.

129 Sets more aggressive long-term silence detection independent of

presence or use of silence compression.

<sdi>

Decimal number specifying the required period of silence, in units of 0.1

second, before the modem can report silence detected at the end of a voice

receive either with the “Presumed End of Message” (QUIT) or “Presumed

Hang up (SILENCE) event reports.

A value of 0 disables the modem silence detection.

The range is 0.1 to 25.5 seconds for <sdi> = 1 to 255.

Defaults:

0,50

Report Commands:

+VSD?

+VSD=?

Reports current of selected values.

Reports supported range of parameter values.

Command: +VSM Compression Method Selection

Description:

This command causes the modem to set the voice compression method, the silence

compression sensitivity, and the voice sampling rate.

Syntax: +VSM=<cml><vsr><sds><sel>

Values:

<cml>

<vsr>

Decimal number identifying the compression method.

<range of values> containing the supported range of voice samples per

second of the analog signal.

<sds>

<sel>

<range of values> containing the supported range of sensitivity settings for

voice receives.

<range of values> containing the supported range of expansion values for

voice transmits.

Defaults:

Report Commands:

1,8000,0,0

+VSM?

Reports current of selected values.

+VSM=?

Reports supported range of parameter values.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Chapter 3 – Voice Commands

Command: +VTD Beep Tone Duration Timer

Description:

This command causes the modem to set the default DTMF/tone generation duration.

Syntax: +VTD=<dur>

Values:

<dur>

Decimal number specifying the default DTMF/tone generation duration in

units of 0.01 second.

A value of 0 specifies the value entered by the S11 parameter (50-255 ms).

The range is 0.01 to 2.55 seconds for <dur> = 1 to 255.

Default:

Report Commands:

100 ms

+VTD?

+VTD=?

Reports current of selected values.

Reports supported range of parameter values.

Command: +VDR Distinctive Ring

Note:

This command does not require the Voice Configuration commands to be set

before using it.

Description:

This command causes the modem to enable or disable reporting of the ring cadence

information and to control the timing of the RING event code report if ring cadence

reporting is enabled.

Syntax: +VDR=<enable>, <report>

Values:

Decimal number corresponding to the selected option.

The modem will not report ring cadence information.

The modem will report ring cadence information as specified for the

<report> subparameter.

Decimal number specifying ring cadence information report when enabled by

the <enable> subparameter.

The modem will produce only DROF and DRON messages. The

modem will not produce any RING event codes. The modem will

report other call progress event codes as normal.

Other The modem will produce only DROF and DRON messages. The

modem will produce a RING event code after <report>/10 seconds

after the falling edge of the ring pulse (i.e., after the DRON report).

Defaults:

0,0

Report Commands:

+VDR?

+VDR=?

Reports current of selected values.

Reports supported range of parameter values.

Command: +VDT

Description:

Control Tone Cadence Reporting

This command is included for compatibility only and has no effect other than returning a

result code.

This command allows the modem to enable or disable reporting of the control tone

cadence information in the frequency band used by the Ringback/Remote Ring, BUSY,

and reorder/Fast Busy tones (usually in the 300 to 600 Hz range).

Syntax: +VDT=<enable>,<report>

Values:

Decimal number corresponding to the selected option.

The modem will not produce any control tone cadence report.

Decimal number specifying the produced any control tone cadence report

when enabled by the <enable> subparameter.

The modem will produce only CPOF and CPON messages.

Other Reserved

Defaults:

0,0

Report Commands:

+VDT?

+VDT=?

Reports current of selected values.

Reports supported range of parameter values.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Chapter 3 – Voice Commands

Command: +VPR Select DTE/Modem Interface Rate (Turn Off Autobaud)

Description:

This command selects the DTE/modem interface rate.

Syntax: +VPR=<rate>

Values:

<rate>

Decimal number corresponding to the DTE/modem interface rate where 0 =

autobaud rate determined by processing the AT command, and

1,2,3,4,8,16,24,48,96 correspond to multipliers of 2400 bps to determine the

actual rate:

0 = Autobaud

1 = 2400 bps

2 = 4800 bps

3 = 7200 bps

4 = 9600 bps

8 = 19200 bps

16 = 38400 bps

24 = 57600 bps

48 = 115200 bps

96 = 230400 bps

Default:

Report Commands:

+VPR?

+VPR=?

Reports current of selected values.

Reports supported range of parameter values.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Chapter 3 – Voice Commands

Speakerphone Commands

Command: +VSP

Description:

Speakerphone ON/OFF

This command turns the speakerphone ON or OFF.

Syntax: +VSP=<mode>

Values:

<mode>

Decimal number corresponding to the selected option.

The speakerphone function is OFF. Default

The speakerphone function is ON.

Default:

Report Commands:

+VSP?

+VSP=?

Reports current of selected values.

Reports supported range of parameter values.

Command: +VGM Microphone Gain

Description:

This command causes the modem to set the microphone gain of the speakerphone

function.

Syntax: +VGM=<gain>

Values:

<gain>

Decimal number between 0 and 255 corresponding to the gain.

The speakerphone mode is full duplex.

Default:

Report Commands:

+VGM?

+VGM=?

Reports current of selected values.

Reports supported range of parameter values.

Command: +VGS Speaker Gain

Description:

This command causes the modem to set the speaker gain of the speakerphone function.

Syntax: +VGS=<gain>

Values:

<gain>

Decimal number between 0 and 255 corresponding to the gain.

The speakerphone mode is full duplex.

Default:

128

Report Commands:

+VGS

+VGS=?

Reports current of selected values.

Reports supported range of parameter values.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Chapter 3 – Voice Commands

Unformatted Form Reporting – Caller ID

The MultiModem does not display the Caller ID information if it detects a checksum error in the caller ID packet

(either SDM or MDM) while in presentation mode. If the MultiModem receives multiple copies of the Caller ID

packets, the MultiModem presents all of the packets to the computer. The MultiModem presents all data items and

packet control information found in the SDM and MDM packets, except the leading Us (line seizure information) from

the presentation. The checksum is included in the presentation. The entire Caller ID packet is presented in ASCII hex

as printable numbers. The characters in the ASCII hex message are in the bit order presented to the MultiModem.

The MultiModem does not insert spaces, <cr>, or <lf> ASCII codes for formatting between the characters of the

packet.

The MultiModem does not check the checksum, and it is the computer’s job to check message validity. Note that this

means that the MultiModem presents the Caller ID information even if the MultiModem detects a check sum error in

the Caller ID packet (SDM or MDM) in the presentation mode.

The MultiModem presents all of the information in the packet in ASCII hex as printable characters. The MultiModem

includes all Message Type Octets, Message Length Octets, Data Octets, and Checksum Octets for the presentation

mode.

Voice Mode Shielded Codes

These codes can be sent in either Command mode or Data mode. The DCE may return the event detection reports

after the OK result code from the +FCLASS command. One or more simple event detection reports may be

embedded within the data portion of a complex event detection report. The Table below describes voice mode

shielded codes. The number in the first column is the ASCII equivalent (in hex). The number in the second column

refers to the numbering scheme used below.

Shielded Hex

Code

Event Report Description

<DLE>

<SUB>

<ETX>

(10)

(1A)

(3)

Two contiguous <DLE><DLE> codes indicate a single <DLE> in the data stream.

<DLE><DLE> in the data stream.

End Data State; signifies the end of voice data. Can end with Event 9 (Presumed Hangup

Timeout), Event 10 (Presumed End of Message), Event 13 (Loop Current Interruption), Event

14 (Loop Current Polarity Reversal), Event 19 (BUSY), or Event 20 (DIALTONE).

(51)

(53)

Data stream shielded Xon character. Used in the +VXT command to shield XON characters in

the full-duplex data stream and in the Packet Protocol.

Data stream shielded Xoff character. Used in the +VXT command to shield

XOFF characters in the full-duplex data stream and in the Packet Protocol.

(4D)

(57)

(46)

(55)

(47)

(54)

(58)

Data stream shielded SOH code used for the Packet Protocol.

Data stream shielded ETB code used for the Packet Protocol.

Data stream shielded ACK code used for the Packet Protocol.

Data stream shielded NAK code used for the Packet Protocol.

Data stream shielded ENQ code used for the Packet Protocol.

Timing Mark.

Packet Header for the "Complex Event Detection Report" (additional event data transfers to

the DTE).

(2E)

Packet Terminator for the "Complex Event Detection Report" (additional event data transfers

to the DTE).

Start of DTMF tone shielding.

DTMF transitions to off.

(2F)

(7F)

(52)

(31)

(32)

(33)

(34)

(35)

(36)

(37)

Event Number 3 (RING). The <DLE> shielded version of the RING result code.

Event Number 4 (DTMF 1).

Event Number 4 (DTMF 2).

Event Number 4 (DTMF 3).

Event Number 4 (DTMF 4).

Event Number 4 (DTMF 5).

Event Number 4 (DTMF 6).

Event Number 4 (DTMF 7).

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Chapter 3 – Voice Commands

Shielded Hex

Code

Event Report Description

(38)

(39)

(30)

(41)

(42)

(43)

(44)

(2A)

(23)

(6F)

(63)

(65)

(68)

(48)

(73)

(71)

(4A)

(24)

(6C)

(4C)

Event Number 4 (DTMF 8).

Event Number 4 (DTMF 9).

Event Number 4 (DTMF 0).

Event Number 4 (Extended Keypad DTMF A).

Event Number 4 (Extended Keypad DTMF B).

Event Number 4 (Extended Keypad DTMF C).

Event Number 4 (Extended Keypad DTMF D).

Event Number 4 (Extended Keypad DTMF E).

Event Number 5 (Receive Buffer Overrun).

Event Number 6 (Facsimile Calling).

Event Number 7 (Data Calling).

Event Number 8 (line current break). Local phone goes on hook.

Event Number 8 (line current detected). Local phone goes off hook.

Event Number 9 (Presumed Hang up "SILENCE" Timeout).

Event Number 10 (Presumed End of Message "QUIET" Timeout).

Event Number 11 (SIT Tone).

Event Number 12 (Bong Tone).

Event Number 13 (Loop Current Interruption). Usually indicates a remote hang up.

Event Number 14 (Loop Current Polarity Reversal). May indicate a hang up or a receive,

depending on CO implementation.

(77)

(74)

(72)

(62)

(64)

(4B)

(46)

(75)

(70)

(50)

(61)

(66)

(56)

(76)

(69)

Event Number 15 (Call Waiting/Beep Interrupt).

Event Number 17 (TDD Detected - 1400/1800).

Event Number 18 (Ringback).

Event Number 19 (BUSY). May be repeatedly sent.

Event Number 20 (DIALTONE). May be repeatedly sent.

Event Number 21 (Reorder/Fast Busy).

Event Number 22 (V.21 Channel 2 7E flags).

Event Number 23 (Transmit Buffer Underrun).

Event Number 24 (Line voltage increase - extension phone goes on hook).

Event Number 24 (Line voltage increase - extension phone goes off hook).

Event Number 25 (Facsimile or Data Answer).

Event Number 26 (Data Answer).

Event Number 27 (Voice Detection). A high confidence of voice.

Event Number 27 (Voice Detection). A low confidence of voice.

Event Number 29 (Stuttered Dial tone).

Event Number 30 (Invalid Voice Data Format. Voice data is incompatible with selected Voice

Compression Methods.

(45)

(

)

(59)

(6d)

(25)

(26)

(27)

(28)

(29)

Event Number 31 (Lost Data Detected Event).

Event Number 32 (Facsimile Answer).

Event Number 63 (manufacturer specific).

Event Number 48 (manufacturer specific).

Event Number 49 (manufacturer specific).

Event Number 50 (manufacturer specific).

Event Number 51 (manufacturer specific).

all other

7-=bit ASCII Reserved for future use.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Chapter 4 – V.8 / V.8bis Commands

V.8 is a way V.34 modems negotiate connections features and options, and V.8bis is a start-up sequence for

multimedia modems.

Command: +A8E V.8 and V.8bis Operation Controls

Description:

This command is defined for two conditions: as a parameter while the modem is on-hook,

and as an action command while the modem is off-hook. If enabled, V.8 negotiation does

not preclude simultaneous implementation of other negotiation means (e.g., V.8bis, V.18,

V.32bis Annex A). It is a compound parameter if issued while the modem is on-hook, used

to precondition V.8 and V.8bis originating and answering operation. It is issued by the

DTE before the Dial (D) or Answer (A) command, regardless of the state of the +FCLASS

parameter. This command is an action command if issued while the modem is off-hook to

(re)start V.8 or V.8bis negotiation.

Example: If initial V.8 negotiation fails, but subsequent T.30 negotiation indicates V.8

capability, this command may be used to initiate V.8 negotiation.

Syntax: +A8E=<v8o>,<v8a>,<v8cf>[,<v8b>][,<cfrange>][,<protrange>]

Values:

<v8o>

Decimal number which enables/disables issuance of +A8x indications

during modem-controlled V.8 origination negotiation.

Enable DCE-controlled V.8 origination negotiation without +A8x

indications. Default

Enable DCE-controlled V.8 origination negotiation with +A8x

indications.

<v8a>=

<v8cf>=

Decimal number which enables/disables issuance of +A8x indications

during modem-controlled V.8 answer negotiation.

Enable DCE-controlled V.8 answer negotiation without +A8x

indications. Default

Enable DCE-controlled V.8 answer negotiation with +A8x

indications.

Set the V.8 CI signal call function to the hexadecimal octet XY

00 Default

<v8b>=

Decimal number which enables/disables V.8bis negotiation.

Disable V.8bis negotiation.

Enable V.8bis negotiation. Default

<cfrange>=

“<string of values>“. Applicable only for <v8a>=5. Not supported.

< protrange >= <string of values>“. Applicable only for <v8a>=5. Not supported.

Default Values:

1,1,00,1,0,0

The ATD and ATA commands behave as specified in V.250, and +A8n indications are not

generated by the modem. For subparameter values <v8o>=6 and <v8a>=5, +A8I

indications are issued during the V.8session to notify the DTE when the relevant V.8

signals are received.

Report Commands:

+A8E? Reports current or selected values.

+A8E=? Reports supported range of parameter values.

Command: +A8I

Description:

CI Signal Indication

This indication is issued by an answering modem, if +A8E,<v8a> .0, to indicate detection

of a V.8 CI signal and report the recovered Call Function octet(s).

Indication Syntax:+A8I:<v8cf><CR>

Values:

<v8cf>

A hexadecimal code octet representation of those Call Function octet(s).

+A8I:0 indicates that the modem timed out waiting for CI.

Example:

+A8I:0 The modem timed out waiting for CI.

+A8I:X YYY

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Chapter 5 – V.25bis Commands

Note: These commands can be used with the MT5600BA only.

The V.25bis commands control synchronous communications between the host and the modem using the HDLC or

character-oriented protocol. Modulation depends on the serial port rate and setting of the transmitting clock source.

These commands apply to modems that support synchronous communications.

Command: CIC

Description:

Connect Incoming Call

Answers an incoming call. Values: n/a

Command: DIC

Description :

Disregard Incoming Call

Disregards current incoming call. Values: n/a

Command: CRNs Call Request Number

Description:

Values:

Used to dial a number

s =dial string (0-9, *, #, :, <, =, P, T)

Command: CRIs Call Request Identification

Description:

Used to dial a number

Values:

s =dial string (0-9, *, #, :, <, =, P, T)

V.25bis Number Format:

0-9

Dialing Digit

Wait tone

Pause

Separator

Dialing to be continue in Pulse mode

Dialing to be continue in DTMF

Command: PRNx;s Program Number

Description:

Values:

Used to store dial string s in location x.

x=(0-3)

s = dial string (0-9, *, #, :, <, =, P, T)

Command: CRSx Call Request Address

Description:

Values:

Recalls dial string to dial from location x.

x=(0-3)

Command: PRIa;s Program Identification Number

Description:

Dummy Command (just returns VAL).

Command: RLD

Description:

List Request of Delayed Call Number

Returns current listing of Delayed numbers. Values: n/a.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Chapter 5 – V.25bis Commands

Command: RLF List Request of Forbidden Number

Description:

Returns current listing of Forbidden Numbers. Values: n/a

Command: RLI

Description:

List Identification Number

Dummy Command (just returns VAL)

Command: RLN List Request of Stored Number

Description:

Returns dial strings stored in locations 0 – 3. Values: n/a

V.25bis Responses

CFIrr

Call Failure Indication (where rr is the equals the following messages)

Call not answered

Engaged tone (same as Busy)

Number on forbidden list (Number is blacklisted)

No dial tone

Number not stored in memory

Call answered but no answer tone

No answer

DLC

INC

Delayed call

Incoming call (RING)

VAL

INV

A valid V.25bis command has been attempted

Invalid

CNXs

Connection with s as the speed connected

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Chapter 6 – S-Registers

Certain modem values, or parameters, are stored in memory locations called S-Rregisters. Use the S command to

read or alter the contents of the S-Registers.

S-Registers

S-Reg Unit

Range Default

Description

1 ring

0,1–255 country dep. Number of Rings to Auto-Answer: Sets the number of rings required before the

modem automatically answers a call. ATS0=0 disables autoanswer completely.

1 ring

0–255

0–127

Ring Counter: Counts the rings that have occurred.

decimal

43 (+)

Escape Character: Sets ASCII code for the escape sequence128–255

character. Values greater than 127 disable escape.

decimal

0–127

0–32

13 (^M)

10 (^J)

8 (^H)

Carriage Return Character: Sets the ASCII code for the carriage return character.

Line Feed Character: Sets the ASCII code for the line feed character.

Backspace Character: Sets the ASCII code for the backspace33–127

character. Values greater than 32 disable backspace.

seconds 2–255

seconds 1–255

country dep. Wait Time Before Blind Dialing or for Dial Tone: Sets the time the modem

waits after it goes off-hook before it begins to dial the phone number.

country dep. Wait Time for Carrier, Silence, or Dial Tone: Sets the time the modem waits for a

carrier signal before aborting a call. Sets the wait for silence time for the @ dial

modifier. Sets the time the modem waits for a dial tone after encountering W in the

dial string.

seconds 0–255

Pause Time for Dial Delay: Sets the length of the pause caused by a comma

character in a dialing command.

100 ms

1–255

Carrier Detect Response Time: Sets the time, in tenths of a second that the

carrier must be present before the modem considers it valid.

S10

Lost Carrier to Hang Up Delay: Sets how long a carrier signal must be lost before

the modem disconnects.

S11

S12

1 ms

50–255

0–255

country dep. DTMF Tone Duration: Sets spacing and duration of dialing tones.

20 ms

Escape Prompt Delay (EPD): Defines the maximum period, in fiftieths of second,

allowed between receipt of the last character of the three escape character

sequences from the computer and the sending of the OK result code to the

computer (escape code guard time).

S13

S15

S17

S24

decimal

minutes

0, 1–127 42 (*)

0, 10–255 30

Remote Configuration Escape Character: Sets the ASCII code for the remote

configuration escape character. ATS13=0&W disables remote configuration. For

use with the MT5600BA and MT5600BR only.

Dialup Backup: Sets the length of time the modem waits after making a dial-up

connection before it checks for a restored lease line. Zero disables dial backup. For

use with the MT5600BA and MT5600BR only.

0–255

Dialup Connection: Sets the length of time the modem waits after a lease line fails

before it attempts a dial-up connection. For use with the MT5600BA and

MT5600BR only.

seconds 0–255

Sleep Inactivity Timer: Sets the number of seconds that the modem operates in

normal mode with no detected telephone or serial port activity before it enters low-

power sleep mode. The timer is reset upon any serial port or telephone line activity.

S25

S26

10 ms (async) 0–255

Delay to DTR OFF: Sets the length of time that the modem1 ms

(sync) ignores DTR while taking the action specified by &D .

10 ms

0–255

RTS to CTS Delay: When &R0 is commanded, sets the time after detecting an

OFF-to-ON transition on RTS before the modem turns CTSON. Applies to

synchronous operation only.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Chapter 6 – S-Registers

S-Reg Unit

Range Default

Description

S29

10 ms

0–255

On Hook Time: Sets the length of time that the modem goes on-hook when it

encounters a flash dial modifier (!) in the dialing string.

S30

10 ms

0, 1–255

Disonnect Inactivity Timer: Sets the length of time that the modem waits before

disconnecting when no data is sent or received. A value of zero disables the timer.

Applies to asynchronous operation only.

S36

decimal

0–7

LAPM Failure Control: Specifies the fallback action to take in the event of an

LAPM negotiation failure. These fallback options are initiated immediately upon

connection if S48 is set to 128. If an invalid number is entered, S36 acts as if the

default value has been entered. (See S48.)

Modem disconnects.

Modem stays online and a direct mode connection is established.

Modem stays on-line; normal mode connection established.

MNP connection is attempted. If it fails, modem disconnects.

MNP connection is attempted. If it fails, a direct mode connection is established.

An MNP connection is attempted and if it fails, a normal modem connection is

established.

S38

seconds 0–254,

255

Delay Before Forced Hang Up: Sets the delay between the modem’s receipt of

the H command to disconnect (or high-to-low transition of DTR if the modem is

programmed to follow the signal) and the disconnect operation. Applies only to

error-correction connections. This register can be used to ensure that data in the

modem buffer is sent before the modem disconnects. If S38 is set between 0 and

254, the modem waits for the remote modem to acknowledge all data in the buffer

before disconnecting. IfS38 is set to 255, the modem does not time out and

continues to attempt to deliver data in the buffer until the connection is lost or the

data is delivered.

S46

S48

decimal

136,

138

Data Compression Control: Enables/disables data compression:

136 Error correction without compression.138 Error correction with compression.

0, 7,

128

V.42 Negotiation Control: Enables or disables LAPM negotiation.

An invalid value is treated as a 128 value.

Disables negotiation and proceeds with LAPM.

Enables negotiation.

128 Disables negotiation. Proceeds at once with the fallback action specified in

S36. Can be used to force MNP.

S86

decimal

0, 3–23

n/a

Call Failure Reason Code: When the modem issues a NO CARRIER result code,

a value is written to this register to help determine the reason for the failed

connection. S86 records the first event that contributes to a NO CARRIER

message. Use the S86? command to read the value.

Normal disconnect; no error occurred.

Call Waiting caused disconnect.

Physical loss of carrier.

No error correction at the other end.

No response to feature negotiation.

This modem is async-only, the other sync-only.

No framing technique in common.

No protocol in common.

10 Bad response to feature negotiation.

11 No sync information from remote modem.

12 Normal disconnect initiated by remote modem.

13 Remote modem doesn’t respond after 10 retransmissions of the message.

14 Protocol violation.

15 DTR lost.

16 Received GSTN clear down.

17 Inactivity timeout.

18 Speed not supported.

19 Long space disconnect.

20 Key abort disconnect.

21 Clears previous disconnect reason.

22 No connection established.

23 Disconnect after three retrains.

24 Call Waiting tone detected.

25 Extension pickup detected.

26 Remote hang up detected.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Chapter 6 – S-Registers

S-Reg Unit

Range Default

Description

S95

decimal

0–255

Extended Result Codes Control: A bit set to a 1 in this register, in conjunction

with the W command, enables the corresponding result code. The +MR, +ER, and

+DR settings also control S95 bits 2, 3, and 5respectively. The more recent settings

of +MR, +ER, and +DR, or host writing of S95 bits 2, 3, and 5, along with the W

command setting, determine the corresponding actual result code reporting (see

+MR, +ER,+DR, and W commands).

Default:

Bit 0

Bit 1

CONNECT result code indicates DCE speed instead of DTE speed.

Append /ARQ to CONNECT XXX result code in error-correction mode

(XXXX=rate).

Bit 2

Enable +MCR: XXXX result code (XXXX=modulation) and +MRR: XXXX

result code (XXXX=rate). (Also see +MR).

Bit 3

Bit 5

Enable +ER XXXX result code (XXXX=protocol identifier).

Enable +DR XXXX result code (XXXX=compression type).

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Chapter 7 – Result Codes

The modem responds to commands from the DTE and to activity on the line by signaling to the DTE in the form of

result codes. The result codes that the modem can send are described below.

Two forms of each result code are available: long-form (verbose) response and a short-form (terse) response. The

long-form code is preceded and terminated by the sequence < CR> < LF>.

The short-form is terminated by < CR>, only with no preceding sequence.

If result messages are suppressed, nothing is returned to the DTE. The long-form results codes can be modified by

the OEM through the .INF file.

Terse Verbose

Description

+F4

+FCERROR

High speed fax data (V.27, V.29, V.33, or V.17) is expected but a V.21 signal is received.

Command executed.

CONNECT

Modem connected to the line. For X command values specifying no speed reporting, the

modem has connected to the line and either the line speed is 300 bps and line speed is

enabled, or the DTE speed is 300 bps and DTE speed reporting is enabled.

Ring signal detected. An incoming ring signal is detected on the line. What qualifies as a

ring signal is determined by country-dependent parameters.

Carrier signal lost/not detected. Sent when trying to establish a call if:

1. Ringback is detected and later ceases but no carrier is detected within the period of

time determined by register S7, or

RING

NO CARRIER

2. No ringback detected within the period of time determined by register S7. Also sent

when the modem auto-disconnects due to loss of carrier.

For X0, sent for the following conditions:

1. If busy tone detection is enforced, busy/circuit-busy has been detected.

2. If dial tone detection is enforced or selected, dial tone has not been detected.

Invalid command. Sent during an attempt to execute a command line if any of the

following conditions occur:

1. Command line contains a syntax error.

2. Modem cannot execute a command contained in the command line; i.e., the

command does not exist or is not supported.

3. Command parameter within command line is outside permitted range.

For X0, X1, X2, and X3, this message is sent instead of DELAYED and BLACKLISTED.

1200 Connected at 1200 bps. Modem connects to the line. Either the line speed is 1200

bps and DCE speed reporting is enabled, or DTE speed is 1200 bps and DTE speed

reporting is enabled.

ERROR

CONNECT

NO DIAL TONE No dial tone detected. For X2 and X4, the modem has been instructed to wait for dial tone

during dialing but none is received.

BUSY

Busy signal detected. For X3 and X4, if busy tone detection is enforced, the busy

(engaged) signal is detected on the line when the modem is attempting to originate a call.

No answer at remote end. Modem is trying to originate a call if a continuous ringback

signal detected on line until the expiration of timer S7.

Connected at 600 bps; speed reporting enabled. Modem connects to the line, the DTE

speed is 600 bps, and speed reporting is enabled.

NO ANSWER

CONNECT 600

CONNECT 2400 Connected at 2400 bps; speed reporting enabled. Modem connects to the line; either the

line speed is 2400 bps with speed reporting enabled, or the DTE speed is 2400 bps and

the DTE speed reporting is enabled.

CONNECT 4800 Connected at 4800 bps and speed reporting enabled. Modem connects to the line; either

the line speed is 4800 bps with DCE speed reporting enabled, or the DTE speed is 4800

bps and the DTE speed reporting is enabled.

CONNECT 9600 Connected at 9600 bps and speed reporting enabled. Modem connects to the line; either

the line speed is 9600 bps with DCE speed reporting enabled, or the DTE speed is 9600

bps and the DTE speed reporting is enabled.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Chapter 7 – Result Codes

Terse Verbose

Description

CONNECT 7200

Connected at 7200 bps and speed reporting enabled. Modem connects to the line

at7200 bps and DCE speed reporting enabled.

Connected at 12000 bps and speed reporting enabled. Modem connects to the line at

12000 bps and DCE speed reporting enabled.

Connected at 14400 bps and speed reporting enabled. Modem connects to the line at

14400 bps and DCE speed reporting enabled.

Connected at 19200 bps and speed reporting enabled. Modem connects to the line;

either line speed is 19200 bps with DCE speed reporting enabled, or DTE speed

is19200 bps and DTE speed reporting is enabled.

CONNECT 12000

CONNECT 14400

CONNECT 19200

CONNECT 38400

Connected at 38400 bps and speed reporting enabled. Modem has connected to the

line, DTE speed is 38400 bps, and DTE speed reporting is enabled.18 CONNECT

57600 Connected at 57600 bps and speed reporting enabled. Modem is connected to

the line, DTE speed is 57600 bps, and DTE speed reporting is enabled.19 CONNECT

115200 Connected at 115200 bps and speed reporting enabled. Modem connects to

the line, DTE speed is 115200 bps, DTE speed reporting is enabled.20 CONNECT

230400 Connected at 230400 bps and speed reporting enabled. Modem has connected

to the line, DTE speed is 230400 bps, and DTE speed reporting is enabled.22

CONNECT V.23 connection and line speed reporting enabled. Modem has established

75TX/1200RX a V.23 originate connection and line speed reporting is enabled.23

CONNECT V.23 connection and line speed reporting enabled. Modem has established

1200TX/75RX a V.23 answer connection and line speed reporting is enabled.24

DELAYED Delay is in effect for the dialed number. For X4, sent when a call fails to

connect and the number dialed is considered ‘delayed’ due to country blacklisting

requirements.32 BLACKLISTED Dialed number is blacklisted. For X4, sent when a call

fails to connect and the number dialed is considered ‘blacklisted’.

FAX

DATA

+MRR: 300

Connected in fax mode. Modem connection is established in a facsimile mode.

Connected in data mode. Modem connection is established in a data mode.

Connected at 300 bps and carrier reporting enabled. Modem connects to the line at 300

bps and carrier reporting is enabled. (See S95 and Xn.)

+MRR: 1200/75

V.23 backward channel. V.23 backward channel carrier is detected; carrier reporting is

enabled. (See S95, Xn.)45 +MRR: 75/1200 V.23 forward channel. V.23 forward channel

carrier is detected; carrier reporting is enabled. (See S95, Xn.)46 +MRR: 1200

Connected at 1200 bps and carrier reporting enabled. Modem connects to the line

at1200 bps and carrier reporting is enabled. (See S95, Xn.)47 +MRR: 2400 Connected

at 2400 bps and carrier reporting enabled. Modem connects to the line at2400 bps and

carrier reporting is enabled. (See S95, Xn.)48 +MRR: 4800 Connected at 4800 bps and

carrier reporting enabled. Modem connects to the line at4800 bps and carrier reporting

is enabled. (See S95, Xn.)49 +MRR: 7200 Connected at 7200 bps and carrier reporting

enabled. Modem connects to the line at7200 bps and carrier reporting is enabled. (See

S95, Xn.)50 +MRR: 9600 Connected at 9600 bps and carrier reporting enabled. Modem

connects to the line at9600 bps and carrier reporting is enabled. (See S95, Xn.)5

+MRR: 12000 Connected at 12000 bps and carrier reporting enabled. Modem connects

to the lineat12000 bps; carrier reporting is enabled. (See S95, Xn.)5 +MRR: 14400

Connected at 14400 bps and carrier reporting enabled. Modem connects to the line at

14400 bps; carrier reporting is enabled. (See S95, Xn.)5 +MRR: 16800 Connected at

16800 bps and carrier reporting enabled. Modem connects to the line at 16800 bps;

carrier reporting is enabled. (See S95, Xn.)5 +MRR: 19200 Connected at 19200 bps

and carrier reporting enabled. Modem connects to the line at 19200 bps; carrier

reporting is enabled. (See S95, Xn.)5 +MRR: 21600 Connected at 21600 bps and

carrier reporting enabled. Modem connects to the line at 21600 bps; carrier reporting is

enabled. (See S95, Xn.)5 +MRR: 24000 Connected at 24000 bps and carrier reporting

enabled. Modem connects to the line at 24000 bps; carrier reporting is enabled. (See

S95, Xn.)5 +MRR: 26400 Connected at 26400 bps and carrier reporting enabled.

Modem connects to the line at 26400 bps; carrier reporting is enabled. (See S95, Xn.)5

+MRR: 28800 Connected at 28800 bps and carrier reporting enabled. Modem connects

to the line at 28800 bps; carrier reporting is enabled. (See S95, Xn.)5 CONNECT 16800

Connected at 16800 bps and DTE speed reporting enabled. Modem connects to the

line, the DTE speed is16800 bps and DTE speed reporting is enabled.

CONNECT 21600

CONNECT 24000

CONNECT 26400

Connected at 21600 bps and DTE speed reporting enabled. Modem connects to the

line, the DTE speed is 21600 bps and DTE speed reporting is enabled.

Connected at 24000 bps and DTE speed reporting enabled. Modem connects to the

line, the DTE speed is 24000 bps and DTE speed reporting is enabled.

Connected at 26400 bps and DTE speed reporting enabled. Modem connects to the

line, the DTE speed is 26400 bps and DTE speed reporting is enabled.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Chapter 7 – Result Codes

Terse Verbose

Description

CONNECT 28800 Connected at 28800 bps and line speed reporting enabled. Modem connects to the line;

either the line speed is 28800 bps and DCE speed reporting is enabled, or the DTE

speed is 28800 bps and DTE speed reporting is enabled.

+DR: ALT

Connected in MNP Class 5 data compression. Modem connects to the line in MNP

Class 5 and +DR: message reporting is enabled. (See S95, Wn, Xn.)

Connected in V.42 bis data compression. Modem connects to the line in V.42 bis and

120 +DR: message reporting is enabled. (See S95, Wn, Xn.)

Connected without data compression. Modem connects to the line without data

compression and +DR: message reporting is enabled. (See S95, Wn, Xn.)

Connected without any protocol. Modem connects to the line without any form of error

correction and +ER: message reporting is enabled. (See S95, Wn, Xn.)

Connected in V.42 LAPM mode. Modem connects to the line in V.42 LAPM error

correction mode. +ER: message reporting is enabled. (See S95, Wn, Xn.)

Connected at 31200 bps; carrier reporting enabled. Modem connects to the line

at31200 bps and carrier reporting is enabled. (See S95, Xn.)

Connected at 33600 bps; carrier reporting enabled. Modem connects to the line

at33600 bps and carrier reporting is enabled. (See S95, Xn.)

Connected in MNP mode. Sent when the modem connects in MNP mode of error

correction. +ER: message reporting has been enabled. (See S95, Wn, Xn.)

Line in use. Modem attempted to go off-hook when an extension was already occupying

the line.

+DR: V.42B

+DR: NONE

+ER: NONE

+ER: LAPM

+MRR: 31200

+MRR: 33600

+ER: ALT

LINE-IN-USE

CONNECT 33600 Connected at 33600 bps. Modem connects to the line, the DTE speed is 33600 bps and

the DTE speed reporting is enabled.

CONNECT 31200 Connected at 31200 bps. Modem connects to the line DTE speed of 31200 bps and the

modem is to report the DTE speed upon connecting.

134

135

136

137

138

139

140

141

142

145

150

151

152

153

154

155

156

157

158

159

+MCR: B103

+MCR: B212

+MCR: V21

Connected with Bell 103 modulation. Modem connects to the line with Bell 103

modulation and modulation reporting is enabled. (See +MR, S95, Xn.)

Connected with Bell 212 modulation. Modem connects to the line with Bell 212

modulation and modulation reporting is enabled. (See +MR, S95, Xn.)

Connected with ITU-T V.21. Modem connects to the line with ITU-T V.21 modulation

and modulation reporting is enabled. (See +MR, S95, Xn.)

Connected with ITU-T V.22. Modem connects to the line with ITU-T V.22 modulation

and modulation reporting is enabled. (See +MR, S95, Xn.)

Connected with ITU-T V.22B. Modem connects to the line with ITU-T V.22B modulation

and modulation reporting is enabled. (See +MR, S95, Xn.)

Connected with ITU-T V.23. Modem connects to the line with ITU-T V.23 modulation

and modulation reporting is enabled. (See +MR, S95, Xn.)

Connected with ITU-T V.32. Modem connects to the line with ITU-T V.32 modulation

and modulation reporting is enabled. (See +MR, S95, Xn.)

Connected with ITU-T V.32B. Modem connects to the line with ITU-T V.32B modulation

and modulation reporting is enabled. (See +MR, S95, Xn.)

Connected with ITU-T V.34. Modem connects to the line with ITU-T V.34 modulation

and modulation reporting is enabled. (See +MR, S95, Xn.)

Connected with ITU-T V.90. Modem connects to the line with ITU-T V.90 modulation

and modulation reporting is enabled. (See +MR, S95, Xn.)

Connected at 32000 bps. Modem connects to the line at 32000 bps and carrier

reporting is enabled. (See S95, Xn.)

Connected at 34000 bps. Modem connects to the line at 34000 bps and carrier

reporting is enabled. (See S95, Xn.)

Connected at 36000 bps. Modem connects to the line at 36000 bps and carrier

reporting is enabled. (See S95, Xn.)

Connected at 38000 bps. Modem connects to the line at 38000 bps and carrier

reporting is enabled. (See S95, Xn.)

Connected at 40000 bps. Modem connects to the line at 40000 bps and carrier

reporting is enabled. (See S95, Xn.)

Connected at 42000 bps. Modem connects to the line at 42000 bps and carrier

reporting is enabled. (See S95, Xn.)

Connected at 44000 bps. Modem connects to the line at 44000 bps and carrier

reporting is enabled. (See S95, Xn.)

+MCR: V22

+MCR: V22B

+MCR: V23

+MCR: V32

+MCR: V32B

+MCR: V34

+MCR: V90

+MRR: 32000

+MRR: 34000

+MRR: 36000

+MRR: 38000

+MRR: 40000

+MRR: 42000

+MRR: 44000

+MRR: 46000

+MRR: 48000

+MRR: 50000

Connected at 46000 bps. Modem connects to the line at 46000 bps and carrier

reporting is enabled. (See S95, Xn.)

Connected at 48000 bps. Modem connects to the line at 48000 bps and carrier

reporting is enabled. (See S95, Xn.)

Connected at 50000 bps. Modem connects to the line at 50000 bps and carrier

reporting is enabled. (See S95, Xn.)

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Chapter 7 – Result Codes

Terse Verbose

+MRR: 52000

Description

160

161

162

165

166

167

168

169

170

171

172

173

174

175

176

177

178

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

Connected at 52000 bps. Modem connects to the line at 52000 bps and carrier

reporting is enabled. (See S95, Xn.)

+MRR: 54000

+MRR: 56000

Connected at 54000 bps. Modem connects to the line at 54000 bps and carrier

reporting is enabled. (See S95, Xn.)

Connected at 56000 bps. Modem connects to the line at 56000 bps and carrier

reporting is enabled. (See S95, Xn.)

CONNECT 32000 Connected at 32000 bps. Modem connects to the line at 32000 bps and DCE speed

reporting is enabled.

CONNECT 34000 Connected at 34000 bps. Modem connects to the line at 34000 bps and DCE speed

reporting is enabled.

CONNECT 36000 Connected at 36000 bps. Modem connects to the line at 36000 bps and DCE speed

reporting is enabled.

CONNECT 38000 Connected at 38000 bps. Modem connects to the line at 38000 bps and DCE speed

reporting is enabled.

CONNECT 40000 Connected at 40000 bps. Modem connects to the line at 40000 bps and DCE speed

reporting is enabled.

CONNECT 42000 Connected at 42000 bps. Modem connects to the line at 42000 bps and DCE speed

reporting is enabled.

CONNECT 44000 Connected at 44000 bps. Modem connects to the line at 44000 bps and DCE speed

reporting is enabled.

CONNECT 46000 Connected at 46000 bps. Modem connects to the line at 46000 bps and DCE speed

reporting is enabled.

CONNECT 48000 Connected at 48000 bps. Modem connects to the line at 48000 bps and DCE speed

reporting is enabled.

CONNECT 50000 Connected at 50000 bps. Modem connects to the line at 50000 bps and DCE speed

reporting is enabled.

CONNECT 52000 Connected at 52000 bps. Modem connects to the line at 52000 bps and DCE speed

reporting is enabled.

CONNECT 54000 Connected at 54000 bps. Modem connects to the line at 54000 bps and DCE speed

reporting is enabled.

CONNECT 56000 Connected at 56000 bps. Modem connects to the line at 56000 bps and DCE speed

reporting is enabled.

CONNECT 230400 Connected at 230400 bps. Modem connects to the line; the DTE speed is 230400 bps,

and DTE SPEED reporting is enabled.

CONNECT 28000 Connected at 28000 bps. Modem connects to the line at 28000 and DCE speed

reporting is enabled.

CONNECT 29333 Connected at 29333 bps. Modem connects to the line at 29333 and DCE speed

reporting is enabled.

CONNECT 30667 Connected at 30667 bps. Modem connects to the line at 30667 bps and DCE speed

reporting is enabled.

CONNECT 33333 Connected at 48000 bps. Modem connects to the line at 33333 bps and DCE speed

reporting is enabled.

CONNECT 34667 Connected at 34667 bps. Modem connects to the line at 34667 bps and DCE speed

reporting is enabled.

CONNECT 37333 Connected at 37333 bps. Modem connects to the line at 37333 bps and DCE speed

reporting is enabled.

CONNECT 38667 Connected at 38667 bps. Modem connects to the line at 38667 bps and DCE speed

reporting is enabled.

CONNECT 41333 Connected at 41333 bps. Modem connects to the line at 41333 bps and DCE speed

reporting is enabled.

CONNECT 42667 Connected at 42667 bps. Modem connects to the line at 42667 bps and DCE speed

reporting is enabled.

CONNECT 45333 Connected at 45333 bps. Modem connects to the line at 45333 bps and DCE speed

reporting is enabled.

CONNECT 46667 Connected at 46667 bps. Modem connects to the line at 46667 bps and DCE speed

reporting is enabled.

CONNECT 49333 Connected at 49333 bps. Modem connects to the line at 49333 bps and DCE speed

reporting is enabled.

CONNECT 50667 Connected at 50667 bps. Modem connects to the line at 50667 bps and DCE speed

reporting is enabled.

CONNECT 53333 Connected at 53333 bps. Modem connects to the line at 53333 bps and DCE speed

reporting is enabled.

CONNECT 54667 Connected at 54667 bps. Modem connects to the line at 54667 bps and DCE speed

reporting is enabled.

+MRR: 28000

Connected at 28000 bps. Modem connects to the line at 28000 bps and carrier

reporting is enabled. (See S95, Xn)

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Chapter 7 – Result Codes

Terse Verbose

+MRR: 29333

Description

196

197

198

199

200

201

202

203

204

205

206

207

208

209

Notes:

Connected at 29333 bps. Modem connects to the line at 29333 bps and carrier

reporting is enabled. (See S95, Xn)

Connected at 30667 bps. Modem connects to the line at 30667 bps and carrier

reporting is enabled. ((See S95, Xn)

Connected at 33333 bps. Modem connects to the line at 33333 bps and carrier

reporting is enabled. (See S95, Xn)

Connected at 34667 bps. Modem connects to the line at 34667 bps and carrier

reporting is enabled. (See S95, Xn)

Connected at 37333 bps. Modem connects to the line at 37333 bps and carrier

reporting is enabled. (See S95, Xn)

Connected at 38667 bps. Modem connects to the line at 38667 bps and carrier

reporting is enabled. (See S95, Xn)

Connected at 41333 bps. Modem connects to the line at 41333 bps and carrier

reporting is enabled. (See S95, Xn)

Connected at 42667 bps. Modem connects to the line at 42667 bps and carrier

reporting is enabled. (See S95, Xn)

Connected at 45333 bps. Modem connects to the line at 45333 bps and carrier

reporting is enabled. (See S95, Xn)

Connected at 46667 bps. Modem connects to the line at 46667 bps and carrier

reporting is enabled. (See S95, Xn)

Connected at 49333 bps. Modem connects to the line at 49333 bps and carrier

reporting is enabled. (See S95, Xn)

Connected at 50667 bps. Modem connects to the line at 50667 bps and carrier

reporting is enabled. (See S95, Xn)

Connected at 53333 bps. Modem connects to the line at 53333 bps and carrier

reporting is enabled. (See S95, Xn)

Connected at 54667 bps. The modem has connected to the line at 54667 bps and

carrier reporting is enabled. (See S95, Xn)

+MRR: 30667

+MRR: 33333

+MRR: 34667

+MRR: 37333

+MRR: 38667

+MRR: 41333

+MRR: 42667

+MRR: 45333

+MRR: 46667

+MRR: 49333

+MRR: 50667

+MRR: 53333

+MRR: 54667

1. See Vn for result code selection; i.e., short form (result code) or verbose/extended (result message).

2. See Wn for extended connect message control.

3. See S95 for extended result code enabling options (which override some Wn commands).

4. See Xn for extended result code subset enabling options.

5. See \Vn for single line connect message enable options.

6. See +MR for modulation reporting control.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Chapter 8 – Setting Country/Regional Codes

Chapter 8 – Setting

Country/Regional Codes

The Default Country/Regional Code is B5.

If You Want to Change the Country/Regional Code

1. View the List of Available Country/Regional Codes by executing the command AT+GCI=?<CR>

2. Set and save the code by executing the command AT+GCI=nn<CR>

Note: nn is the country/regional code. See the country/regional code list on the Multi-Tech Web site

3. OK is displayed.

4. The country code is then displayed (see the example below).

To Verify the Country Code

1. Type AT+GCI?<CR>, or you can type ATI5<CR>

Example

1. Type the command AT+GCI=B5<CR>

2. Verify B5 was set by typing AT+GCI?<CR> or ATI5<CR>

3. B5 indicates the configuration is set for any B5 country such as Canada or the United States, etc.

Countries/Regions Supported

See the list on the Multi-Tech Web site of countries and regions supported.

Go to:

http://www.multitech.com/PRODUCTS/Info/approvals

Then click on global modems. The Global Modem Country/Region Approvals page displays. On this page you can

view approvals, configuration strings (which includes the country/regional code) and responses available in list form

by selecting the country/region and/or product.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Index

+FCLASS=8 – Select Voice Mode........................28

+FLO – Flow Control ............................................29

+GCI – Country/Region of Installation ..................14

+IFC – DTE-Modem Local Flow Control...............23

+ILRR – DTE-Modem Local Rate Reporting ........23

+IPR – Fixed DTE Rate........................................24

+MR – Modulation Reporting Control ...................24

+MS= – Modulation Selection...............................14

+PCW=n – Call Waiting Enable............................17

+PIG=n – PCM Upstream Ignore..........................17

+PQC=n – Quick Connect Control........................17

+PSS – Use Short Sequence ...............................17

+VCID=n – Caller ID Selection .............................19

+VDR – Distinctive Ring .......................................35

+VDT – Control Tone Cadence Reporting............35

+VGM – Microphone Gain....................................37

+VGR – Voice Gain Receive (Record Gain).........31

+VGS – Speaker Gain..........................................37

+VGT – Voice Gain Transmit (Playback Volume).31

+VIP – Voice Initialize All Parameters ..................30

+VIT – Voice Inactivity Timer (DTE/Modem) ........32

+VLS – Analog Source/Destination Selection.......32

+VNH – Automatic Hang-up Control.....................29

+VPR – Select DTE/Modem Interface Rate (Turn

Off Autobaud)....................................................36

+VRA – Ringback Goes Away Timer....................33

+VRID= – Caller ID Report Retrieved...................19

+VRN – Ringback Never Appeared Timer............34

+VRX – Start Modem Receive..............................30

+VSD – Silence Detection (Quiet and Silence).....34

+VSM – Compression Method Selection..............34

+VSP – Speakerphone ON/OFF ..........................37

+VTD – Beep Tone Duration Timer......................35

+VTS – Send Voice Tone(s).................................30

+VTX – Start Modem Transmit (Playback) ...........31

A – Answer code ....................................................5

A/ – Repeat Last Command ...................................5

\An – Maximum MNP Block Size..........................12

AT – Attention code................................................5

Bn – Communication Standard Setting...................5

\Bn – Transmit Break............................................12

CIC – Connect Incoming Call ...............................41

CRIs – Call Request Identification........................41

CRNs – Call Request Number..............................41

CRSx – Call Request Address..............................41

DIC – Disregard Incoming Call .............................41

Ds – Dial.................................................................5

DS=n – Dial Stored Telephone Number .................6

En – Echo Command Mode Characters.................6

Hn – Hook Control..................................................6

In – Information Request ........................................6

\Kn – Break Control ..............................................13

-Kn – MNP Extended Services .............................15

L5 – Lists Current Operating Parameters...............6

Mn – Monitor Speaker Mode ..................................6

\Nn – Error Correction Mode Selection.................13

On – Return Online to Data Mode ..........................6

32-bit Frame Check Sequence – +EFCS.................21

Analog Source/Destination Selection – +VLS ..........32

Answer – A.................................................................5

AT Commands

#CBNn – Store Callback Number.........................19

#CBPn – Store Callback Password ......................19

#DBn – Callback Enable/Disable..........................19

$Cn – Key Abort ...................................................15

$Dn – DTR Dialing................................................15

$SBn – Serial Port Baud Rate ..............................15

%Cn – Data Compression Control........................11

%En – Line Quality Monitor..................................12

%L – Line Signal Level.........................................12

%Q – Line Signal Quality......................................12

%U – PCM Code Selection ..................................12

&Cn – Data Carrier Detect (DCD) Control..............8

&Dn – Data Terminal Ready (DTR) Control............8

&En – Modem-Initiated Flow Control......................9

&En – V.42 Error Correction Modes .......................8

&En – V.42bis Data Compression ..........................9

&Fn – Load Factory Settings ..................................9

&Gn – V.22bis Guard Tone Control........................9

&Kn – Flow Control Selection.................................9

&Mn – Communications Mode................................9

&Pn – Make/Break Dial Ratio ...............................10

&Qn – Sync/Async Mode......................................10

&Rn – Clear to Send (CTS) Control......................10

&Sn – Data Set Ready (DSR) Control..................10

&Tn – Local Analog Loopback Test......................10

&Tn – V.54 Test Command ..................................27

&Vn – Display Current Configuration and Statistics

for Last Connection...........................................10

&Wn – Store Current Configuration......................11

&Xn – Synchronous Clock Source........................11

&Yn – Select Profile for Hard Reset .....................11

&Z3 – Leased-Line Dial Back-up Number Storage

..........................................................................11

&Zn – Store Telephone Number...........................11

** – Flash Memory Download ...............................15

*B – View Numbers in Blacklist.............................15

*D – View Delayed Numbers ................................15

*E – Escape Remote Configuration......................16

+++ – Escape Sequence ......................................16

+A8E – V.8 and V.8bis Operation Controls ..........40

+A8I – CI Signal Indication ...................................40

+DR – Data Compression Reporting ....................20

+DS – Data Compression.....................................20

+DS44 – V.44 Compression Select ......................20

+EB – Break Handling in Error Control Operation 21

+EFCS – 32-bit Frame Check Sequence .............21

+ER – Error Control Reporting .............................21

+ESR – Selective Reject ......................................22

+ETBM – Call Termination Buffer Management...22

+FCLASS= – Display Current Fax Class..............13

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Index

P – Pulse Dialing ....................................................6

-QCPC – Force Full Startup Procedure Next

Connection........................................................18

-QCPS – Enable Quick Connect Profile Save ......18

Qn – Result Codes Enable/Disable ........................7

RLD – List Request of Delayed Call Number .......41

RLF – List Request of Forbidden Number............42

RLI – List Identification Number............................42

RLN – List Request of Stored Number .................42

PRIa .....................................................................41

PRNx....................................................................41

Sr – Select Register................................................7

Sr? – Read Register Value.....................................7

Sr=n – Set Register Value......................................7

-STE= – Set Telephony Extension .......................25

T – Tone Dialing .....................................................7

Vn – Result Code Format.......................................7

\Vn – Single Line Connect Message.....................13

Wn – Connect Message Control.............................7

Xn – Result Code Selection....................................7

Yn – Long Space Disconnect .................................8

Zn – Modem Reset.................................................8

Attention code – AT....................................................5

Automatic Hang-up Control – +VNH ........................29

Data Carrier Detect (DCD) Control – &Cn..................8

Data Compression – +DS ........................................20

Data Compression Control – %Cn ...........................11

Data Compression Reporting – +DR........................20

data mode..................................................................4

Data Set Ready (DSR) Control – &Sn......................10

Data Terminal Ready (DTR) Control – &Dn...............8

Dial – Ds ....................................................................5

Dial Stored Telephone Number – DS=s.....................6

Display Current Configuration and Statistics for Last

Connection – &Vn.................................................10

Display Current Fax Class – +FCLASS= .................13

Disregard Incoming Call – DIC.................................41

Distinctive Ring – +VDR...........................................35

DLC – V.25bis Response.........................................42

DTE Commands

+IFC – DTE-Modem Local Flow Control...............23

+ILRR – DTE-Modem Local Rate Reporting ........23

+IPR – Fixed DTE Rate........................................24

DTE-Modem Local Flow Control – +IFC ..................23

DTE-Modem Local Rate Reporting – +ILRR............23

DTR Dialing – $Dn ...................................................15

Beep Tone Duration Timer – +VTD..........................35

Break Control – \Kn..................................................13

Break Handling in Error Control Operation – +EB....21

Echo Command Mode Characters – En.....................6

Enable Quick Connect Profile Save – -QCPS..........18

Enter Key ...................................................................5

Error Control Commands

+EB – Break Handling in Error Control Operation 21

+EFCS – 32-bit Frame Check Sequence .............21

+ER – Error Control Reporting .............................21

+ESR – Selective Reject ......................................22

+ETBM – Call Termination Buffer Management...22

Error Control Reporting – +ER.................................21

Error Correction Mode Selection – \Nn ....................13

Escape Commands

*E – Escape Remote Configuration......................16

+++ – Escape Sequence ......................................16

Escape Remote Configuration – *E..........................16

Escape Sequence – +++..........................................16

Call Control Command

-STE= – Set Telephony Extension .......................25

Call Request Address – CRSx .................................41

Call Request Identification – CRIs............................41

Call Request Number – CRNs .................................41

Call Termination Buffer Management – +ETBM.......22

Call Waiting Enable – +PCW=n ...............................17

Callback Enable/Disable – #DBn .............................19

Callback Security Commands

#CBNn – Store Callback Number.........................19

#CBPn – Store Callback Password ......................19

#DBn – Callback Enable/Disable..........................19

+DR – Data Compression Reporting ....................20

+DS – Data Compression.....................................20

+DS44 – V.44 Compression Select ......................20

Caller ID Commands

+VCID=n – Caller ID Selection .............................19

+VRID= – Caller ID Report Retrieved...................19

Caller ID Report Retrieved – +VRID= ......................19

Caller ID Selection – +VCID=n.................................19

CFI – V.25bis Response ..........................................42

CI Signal Indication – +A8I.......................................40

Clear to Send (CTS) Control – &Rn .........................10

CNX – V.25bis Response ........................................42

command mode .........................................................4

command string..........................................................4

Communication Standard Setting – Bn ......................5

Communications Mode – &Mn...................................9

Compression Method Selection – +VSM..................34

Connect Incoming Call – CIC...................................41

Connect Message Control – Wn ................................7

Control Tone Cadence Reporting – +VDT ...............35

Countries or regions supported................................51

Country/Region of Installation – +GCI......................14

Country/Regional Codes Setting..............................51

Fixed DTE Rate – +IPR............................................24

Flash Memory Download – **...................................15

Flow Control – +FLO................................................29

Flow Control Selection – &Kn ....................................9

Force Full Startup Procedure Next Connection – -

QCPC...................................................................18

Hook Control – Hn......................................................6

INC – V.25bis Response..........................................42

Information Request – In............................................6

Key Abort – $Cn.......................................................15

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Index

Select Register – Sr ...................................................7

Select Voice Mode – +FCLASS=8 ...........................28

Selective Reject – +ESR..........................................22

Send Voice Tone(s) – +VTS ....................................30

Serial Port Baud Rate – $SBn..................................15

Set Register Value – Sr=n..........................................7

Set Telephony Extension – -STE=...........................25

Silence Detection (Quiet and Silence) – +VSD ........34

Single Line Connect Message – \Vn ........................13

Speaker Gain – +VGS..............................................37

Speakerphone Commands

+VGM – Microphone Gain....................................37

+VGS – Speaker Gain..........................................37

+VSP – Speakerphone ON/OFF ..........................37

Speakerphone ON/OFF – +VSP..............................37

S-Registers ..............................................................43

Start Modem Receive – +VRX .................................30

Start Modem Transmit (Playback) – +VTX...............31

Store Callback Number – #CBNn.............................19

Store Callback Password – #CBPn..........................19

Store Current Configuration – &Wn..........................11

Store Telephone Number – &Zn ..............................11

Sync/Async Mode – &Qn .........................................10

Synchronous Clock Source – &Xn ...........................11

Leased-Line Dial Back-up Number Storage – &Z3 ..11

Line Quality Monitor – %En......................................12

Line Signal Level – %L.............................................12

Line Signal Quality – %Q .........................................12

List Identification Number – RLI ...............................42

List Request of Delayed Call Number – RLD...........41

List Request of Forbidden Number – RLF................42

List Request of Stored Number – RLN.....................42

Lists Current Operating Parameters – L5...................6

Load Factory Settings – &Fn......................................9

Local Analog Loopback Test – &Tn .........................10

Long Space Disconnect – Yn.....................................8

Make/Break Dial Ratio – &Pn...................................10

Maximum MNP Block Size – \An..............................12

Microphone Gain – +VGM........................................37

MNP Extended Services – -Kn.................................15

Modem Connection Commands

+PCW=n – Call Waiting Enable............................17

+PIG=n – PCM Upstream Ignore..........................17

+PQC=n – Quick Connect Control........................17

+PSS – Use Short Sequence ...............................17

-QCPC – Force Full Startup Procedure Next

Connection........................................................18

-QCPS – Enable Quick Connect Profile Save ......18

Modem Reset – Zn.....................................................8

Modem-Initiated Flow Control – &En..........................9

Modulation Command

Test Command

&Tn – V.54 Test Command ..................................27

Tone Dialing – T.........................................................7

Transmit Break – \Bn ...............................................12

+MR – Modulation Reporting Control ...................24

Modulation Reporting Control – +MR.......................24

Modulation Selection – +MS= ..................................14

Monitor Speaker Mode – Mn......................................6

Unformatted Form Reporting – Caller ID..................38

Use Short Sequence – +PSS...................................17

V.22bis Guard Tone Control – &Gn ...........................9

V.25bis Commands

Online command mode..............................................4

CIC – Connect Incoming Call ...............................41

CRIs – Call Request Identification........................41

CRNs – Call Request Number..............................41

CRSx – Call Request Address..............................41

DIC – Disregard Incoming Call .............................41

RLD – List Request of Delayed Call Number .......41

RLF – List Request of Forbidden Number............42

RLI – List Identification Number............................42

RLN – List Request of Stored Number .................42

PRIa .....................................................................41

PRNx....................................................................41

V.42 Error Correction Modes – &En...........................8

V.42bis Data Compression – &En..............................9

V.44 Compression Select – +DS44..........................20

V.54 Test Command – &Tn......................................27

V.8 / V.8bis Commands

+A8E – V.8 and V.8bis Operation Controls ..........40

+A8I – CI Signal Indication ...................................40

V.8 and V.8bis Operation Controls – +A8E..............40

VAL – V.25bis Response .........................................42

View Delayed Numbers – *D....................................15

View Numbers in Blacklist – *B................................15

Voice Commands

PCM Code Selection – %U......................................12

PCM Upstream Ignore – +PIG=n .............................17

press Enter.................................................................4

Pulse Dialing – P........................................................6

Quick Connect Control – +PQC=n ...........................17

Read Register Value – Sr? ........................................7

Repeat Last Command – A/.......................................5

Result Code Format – Vn...........................................7

Result Code Selection – Xn .......................................7

Result Codes Enable/Disable – Qn............................7

results codes....................................46, 47, 48, 49, 50

Return Online to Data Mode – On..............................6

Ringback Goes Away Timer – +VRA .......................33

Ringback Never Appeared Timer – +VRN ...............34

Program Identification Number – PRIa.....................41

Program Number – PRNx ........................................41

Select DTE/Modem Interface Rate (Turn Off

+VDR– Distinctive Ring ........................................35

+VDT– Control Tone Cadence Reporting.............35

+VGR – Voice Gain Receive (Record Gain).........31

+VGT – Voice Gain Transmit (Playback Volume).31

+VIP – Voice Initialize All Parameters ..................30

Autobaud) – +VPR ...............................................36

Select Profile for Hard Reset – &Yn.........................11

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

Index

+VTS – Send Voice Tone(s).................................30

+VTX – Start Modem Transmit (Playback) ...........31

Voice Configuration Commands

+FCLASS=8 – Select Voice Mode........................28

+FLO – Flow Control ............................................29

+VNH – Automatic Hang-up Control.....................29

Voice Gain Receive (Record Gain) – +VGR ............31

Voice Gain Transmit (Playback Volume) – +VGT ....31

Voice Inactivity Timer (DTE/Modem) – +VIT............32

Voice Initialize All Parameters – +VIP......................30

Voice Mode Shielded Codes....................................38

+VIT – Voice Inactivity Timer (DTE/Modem) ........32

+VLS – Analog Source/Destination Selection.......32

+VPR – Select DTE/Modem Interface Rate (Turn

Off Autobaud)....................................................36

+VRA – Ringback Goes Away Timer....................33

+VRN – Ringback Never Appeared Timer............34

+VRX – Start Modem Receive..............................30

+VSD – Silence Detection (Quiet and Silence).....34

+VSM – Compression Method Selection..............34

+VTD – Beep Tone Duration Timer......................35

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)

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