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16–26
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> →
← OK Returns to the command
state.
AT+VSM=2 → Changes to 2-bit AD-
PCM for recording.
← OK
AT+VRX → Starts recording.
← CONNECT
← <DATA>
← <DLE>s The DCE detects silence.
<DLE><!> → Stops recording.
← <DATA> The DCE delivers the re-
maining data.
← <DLE><ETX>
← OK Returns to the command
state.
(The DTE ought to delete this silence file.)
AT+FCLASS=0 → Switches to data mode
← OK
ATA → Tries to handshake in
data mode.
Switches to data mode and answers the data call…
Note: If a modem data tone is detected - a <DLE>e response -, the mo-
dem should be switched to data mode.
DTE DCE Description