AT+VTX
--->
Start to play
<---
CONNECT
<DATA>
--->
<DLE><ETX>
--->
<---
VCON
Return to command state
AT+VLS=0
--->
Deactivate internal speaker
<---
OK
AT+FCLASS=0
--->
Return to data mode
<---
OK
3. Voice file playing via line.
DTE
DCE
comments
-----------
------
--------------
--------------------
AT+FCLASS=8
--->
Switch to voice mode
<---
OK
AT+VSM=?
--->
1;CELP;1;0;(9600)
2;ADPCM;2;0;(9600)
3;ADPCM;3;0;(9600)
<---
OK
AT+VSM=1
--->
Select CELP compression method
<---
OK
AT+VLS=2
--->
Connect to line
<---
VCON
AT+VTX
--->
Start to play
<---
CONNECT
<DATA>
--->
<DLE><ETX>
--->
<---
VCON
Return to command state
AT+VLS=0
--->
Deactivate line connection
<---
OK
AT+FCLASS=0
--->
Return to data mode
<---
OK
4. Answering machine (Voice call).
DTE DCE comments
---------- -------------- -------------------
AT+FCLASS=8
--->
Switch to voice mode
<---
OK
AT+VSM=?
--->