Comtrol AT Commands - Manual (Page 194)

AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
Conexant 102184B
5-18
+VSM - 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>
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 value of 0 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.