ZyXEL Communications 2864 Series, User Manual, Page: 194 / 267

16–18
• AT+V SM =<
cml
>
This command causes the DCE to select a compression method as follows:
The DCE returns the
OK
result code if the DCE accepts this command, or it re-
turns the
ERROR
result code if the <cml> value is out of range.
• AT+V SM ?
This command causes the DCE to report the current compression setting in the
following form:
<cml>;<scs>;<vsr>
OK
where
<cml>
is the compression method label.
<scs> is the silence compression sensitivity.
<vsr> is the voice sampling rate.
• AT+V SM =?
This command causes the DCE to report the compression methods supported. The
response is as follows:
2;ADPCM;2;0;(9600)
3;ADPCM;3;0;(9600)
30;ADPCM;3;0;(9600)
4;ADPCM;4;0;(9600)
OK
The first item in each line is the compression method label, the second item is the
compression scheme, the third item is the number of bits per sample, the fourth
item is the silence detection threshold level, and the fifth item is the sampling rate.
• AT+V TD =<
dur
>,
<int>
This command causes the DCE to set the default DTMF tone generation duration
<
dur
> and comma pause intercal <
int
> used in conjunction with
AT+VTS
com-
mand.
The range of <dur> and <int> is from 0 to 255. The units are 10 msec. The default
value for <dur> is 50 (500 ms) and for <int> is 7 (70 ms).
The DCE returns the
OK
result code if the DCE accepts this command, or it re-
turns the
ERROR
result code if any of the <
dur
> or <
int
> values is out of range.
<cml> Compression Method Description
2 ZyXEL 2-bit ADPCM (default)
3 ZyXEL 3-bit ADPCM
30 ZyXEL new 3-bit ADPCM
4 ZyXEL 4-bit ADPCM