Multi-Tech Systems MT5600SMI-L92, MT5600SMI-XL34 manual Command +VRA Ringback Goes Away Timer, 110

	Chapter 7 – Voice Commands
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.

Multi-Tech Systems, Inc. SocketModem MT5600SMI Developer’s Guide 110