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Chapter 7 – Voice Commands
Multi-Tech Systems, Inc. SocketModem MT5600SMI Developer’s Guide 110
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>
Defined 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. The range is 0.1 to 25.5 seconds for
<interval> = 1 to 255.
Reporting Current or Selected Values:
Command: +VRA?
Response: <interval>
Example: 50 (5 seconds) For the default setting.
Reporting Supported Range of Parameter Values:
Command: +VRA=?
Response: (<interval> range)
Example: (0-255) 255 = 25.5 sec
Result Codes: OK <interval> = 0-255
ERROR Otherwise, or if not in Voice Mode.
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>
Defined 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.
Reporting Current or Selected Values:
Command: +VRN?
Response: <interval>
Example: 10 (10 seconds) For the default setting.
Reporting Supported Range of Parameter Values:
Command: +VRN=?
Response: (<interval> range)
Example: (0-25)
Result Codes: OK <interval> = 0-25
ERROR Otherwise, or if not in Voice Mode.
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>
Defined 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.