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16–25
Answering machine (Data call)
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 greet-
ing message.
← CONNECT
<DATA> →
← <DLE>c
or
<DLE>5
T.30 fax calling tone
or
DTMF digit '5' is detected.
<DATA> →
<DLE><ETX> →
← OK Returns to the com-
mand state.
AT+FCLASS=2 → Switches to fax mode.
← OK
ATA → Tries to handshake in the
fax mode.
Switches to fax mode and answers the fax call…
Note: If a modem data tone is detected - a <DLE>e response, the modem
should be switched to data mode.
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
DTE DCE Description