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16–8
Voice AT Commands
The following is a summary of the supported voice AT commands:
AT Command Syntax
AT is the command line prefix. Voice commands take one of the following forms:
<ETX> (0x3) Ends Transmission Data State: The DTE sends this code to signify
the end of the voice data from the DTE and cause the DCE to re-
turn to the Voice Command State. The DCE will complete the
transmission of the contents of its buffer before switching to the
Voice Command State and returning the OK result code.
<DC4> (0x14) Clears the transmission buffer of voice data and ends Trans-
mission Data State: The DTE sends this code to indicate the
end of the voice data from the DTE and cause the DCE to re-
turn to the Voice Command State. The DCE will clear its inter-
nal transmission buffer before switching to the Voice
Command State and returning the OK result code.
<CAN> (0x18) Clears the transmission buffer of voice data: This code com-
mands the DCE to (1) clear its internal transmission buffer;
(2) get ready for a new voice data stream with the same pa-
rameters as the last stream; and (3) reset its compressors
and send silence over to the analog destination while paused.
<FS> (0x1C)
or
<DC2>(0x12)
Concatenates transmission data streams: The DTE sends this
code to indicate the start of a new voice data stream with the
same parameters as the last stream without first returning to
the Voice Command State. The DCE will transmit the remain-
der of its internal transmission buffer and reset its compres-
sors before transmitting the data following the <DLE><FS> or
<DLE><DC2> codes.
! (0x21) Ends Receival Data State: The DTE sends this code to indicate
the end of voice data reception and the return to the Voice
Command State. The DCE will discard the contents of its re-
ceival buffer before switching to the Voice Command State and
returning the OK result code.
+V<CM>? Reads the current setting.
+V<CM>=? Reads permissible settings.
+V<CM>=<string> Sets a single-value parameter.
+V<CM>=<value string> Sets a compound parameter.