OK
with <CR><LF> between each line.
AT+VSD=?
This command causes the DCE to report the permitted range of <sds> and <sdi>. The
response is:
(0-31),(0-255)
OK
with <CR><LF> between each line.
AT+VSM=<cml>
This command causes the DCE to select a compression method as follows:
<cml> = 1, 9.6 Kbps CELP (Code Excited Linear Prediction)
<cml> = 2 (Default), 19.2 Kbps 2-bit ADPCM
<cml> = 3, 28.8 Kbps 3-bit ADPCM
Note: Only PLUS models support CELP mode.
AT+VSM?
This command causes the DCE to report current compression settings in the following form:
<cml>;<scs>;<vsr>
OK
with <CR><LF> between each line. Where
<cml>: compression method label.
<scs>: silence compression sensitivity.
<vsr>: voice sampling rate.
AT+VSM=?
This command causes the DCE to report the compression methods supported. The
response is as follows:
1;CELP;1;0;(9600)
2;ADPCM;2;0;(9600)
3;ADPCM;3;0;(9600)
OK
with <CR><LF> between each line.
The first item in each line is the compression method label; the second item is the
compression scheme; the third item is number of bits per sample; the fourth item is the silence
detection threshold level; the fifth item is the sampling rate.
AT+VTS=<string>
