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 greeting message
<--- CONNECT
<DATA> --->
<DLE><ETX> --->
<--- VCON return to command state
AT+VRX ---> Start to record
<--- CONNECT
<--- <DATA>
<--- <DLE>b DCE detects busy tone
or or
<DLE>q long period of quiet
AT ---> Stop recording
<--- <DATA> DCE deliver remaining data
<--- <DLE><ETX>
<--- VCON Return to command state
AT+VLS=0 ---> Deactivate line connection
<--- OK
AT+FCLASS=0 ---> Return to data mode
<--- OK
5. Answering machine (Fax call).
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
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