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Answering machine (Voice call)
AT+VLS=2 → Connects to the line.
← VCON
AT+VTX → Starts replay.
← CONNECT
<DATA> →
<DLE><ETX> →
← OK Returns to the command
state.
AT+VLS=0 → Deactivates the line con-
nection.
← OK
AT+FCLASS=0 → Returns to the data mode.
← OK
DTE DCE Description
AT+FCLASS=8 → Switches to voice mode.
← OK
AT+VSM=? →
← 2;ADPCM;2;0;(9600)
3;ADPCM;3;0;(9600)
30;ADPCM;3;0;(9600)
4;ADPCM;4;0;(9600)
OK
AT+VSM=4 → Selects 4-bit ADPCM for
the greeting message.
← OK
AT+VLS=2 → Connects to the line.
← VCON
AT+VTX → Starts to play the greeting
message.
← CONNECT
<DATA> →
<DLE><ETX> →
DTE DCE Description