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=8 ---> Activate external microphone
or telephone set on LINE Jack
<--- VCON
AT+VRX ---> Start to record
<--- CONNECT
<--- <DATA>
AT ---> Stop recording
<--- <DATA>
<--- <DLE><ETX>
<--- VCON Return to command state
AT+VLS=0 ---> Deactivate external microphone
or telephone set on LINE Jack
<--- OK
AT+FCLASS=0 Return to data mode
<--- OK
2. Voice file playing via internal speaker.
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=16 ---> Activate internal speaker
<--- VCON
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