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=? --->
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