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.

Default:

Interval of 10 (10 seconds)

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.

 

 

0

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.

Defaults:

0,50

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

 

 

Report Commands:

+VSD?

Reports current of selected values.

 

+VSD=?

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>

Decimal number identifying the compression method.

 

<vsr>

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

 

 

second of the analog signal.

 

<sds>

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

 

 

voice receives.

 

<sel>

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

Defaults:

1,8000,0,0

voice transmits.

 

 

Report Commands:

+VSM?

Reports current of selected values.

 

+VSM=?

Reports supported range of parameter values.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273G)

34

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Multi-Tech Systems MT5600BA-V92 Command +VRN Ringback Never Appeared Timer, Command +VSM Compression Method Selection
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MT5600BA-V92 specifications

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