Multi-Tech Systems MT5600SMI-PL34, MT5600SMI-XL34 Command +VSM Compression Method Selection, 111

Chapter 7 – Voice Commands

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 Hangup (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.

Reporting Current or Selected Values: Command: +VSD?

	Response: <sds>,<sdi>
	Example: 0,50 For the default setting.
Reporting Supported Range of Parameter Values:
	Command: +VSD=?
	Response: (<sds> range),(<sdi> range)
	Example: (0,127-129),(0-255)
Result Codes:	OK <hook> = 0 or 1.
	ERROR Otherwise, or if not in Voice Mode.

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>
Defined 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.
	<scs> <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 voice transmits.
Reporting Current or Selected Values:
	Command: +VSM?
	Response: <cml>,<vsr>,<sds>,<sel>
	Example: 1,8000,0,0 For the default setting.
Reporting Supported Range of Parameter Values:
	Command: +VSM=?
	Response: <cml>,<cmid>,<bps>,<tm>,<vsr>,<sds>,<sel>
	<cml> Decimal number identifying the compression method (1, 129, 130, 140,
	or 141).
	<cmid> Alphanumeric string describing the compression method (UNSIGNED
	PCM, IMA ADPCM, UNSIGNED PCM, 2 Bit ADPCM, or 4 Bit ADPCM).
	<bps> Decimal number defining the average number of bits in the
	compressed sample not including silence compression (2, 4 or 8).
	<tm> Decimal number (0) reporting the time interval, in units of 0.1 second,
	between timing marks. A 0 value reports that timing marks are not supported.
	<vsr> <range of values> containing the supported range of voice samples per
	second of the analog signal (8000).
	<scs> <range of values> containing the supported range of sensitivity settings
	for voice receives (0). A 0 indicates not supported.
	<sel> <range of values> containing the supported range of expansion values
	for voice transmits (0). A 0 indicates not supported.
	Example: 1,"UNSIGNED PCM",8,0,8000,0,0
	129,"IMA ADPCM",4,0,8000,0,0
	130,"UNSIGNED PCM",8,0,8000,0,00
	140,"2 Bit ADPCM",2,0,8000,0,0
	141,"4 Bit ADPCM",4,0,8000,0,0
	OK
Result Codes:	OK Valid range.
	ERROR Otherwise, or if not in Voice Mode.

Multi-Tech Systems, Inc. SocketModem MT5600SMI Developer’s Guide 111