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Chapter 3 – Voice Commands
Command: +VRN
Description:
Ringback Never Appeared Timer
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:
Result Codes:
Report Commands:
Command: +VSD
Description:
Interval of 10 (10 seconds)
OK <interval> = 0-25
ERROR Otherwise, or if not in Voice Mode.
+VRN? Reports current of selected values.
+VRN=? Reports supported range of parameter values.
Silence Detection (Quiet and Silence)
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>
<sdi>
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.
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:
Report Commands:
Command: +VSM
Description:
0,50
+VSD? Reports current of selected values.
+VSD=? Reports supported range of parameter values.
Compression Method Selection
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>
<sds>
<sel>
Decimal number identifying the compression method.
<range of values> containing the supported range of voice samples per
second of the analog signal.
<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)
34
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