AT Command Reference Manual
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7.3 AT VOICE COMMAND SUMMARY
Table 7-4 provides a complete summary of the AT voice commands described in detail in Sections 7.3.1 and 7.3.2.
Table 7-4. AT Voice Commands
Command
Function
A
Answering in Voice/Audio Mode.
D
Dial command in Voice/Audio Mode.
H
Hang up in Voice/Audio Mode.
Z
Reset from Voice/Audio Mode.
#BDR
Select baud rate (turn off autobaud).
#CID
Enable Caller ID detection and select reporting format.
#CLS
Select data, fax, or voice/audio.
#MDL?
Identify model.
#MFR?
Identify manufacturer.
#REV?
Identify revision level.
#TL
Audio output transmit level.
#VBQ?
Query buffer size.
#VBS
Bits per sample (ADPCM or PCM).
#VBT
Beep tone timer.
#VCI?
Identify compression method (ADPCM).
#VLS
Voice line select (ADPCM or PCM).
#VRA
Ringback goes away timer (originate).
#VRN
Ringback never came timer (originate).
#VRX
Voice Receive Mode (ADPCM or PCM).
#VSD
Enable silence deletion (voice receive, ADPCM).
#VSK
Buffer skid setting.
#VSP
Silence detection period (voice receive, ADPCM).
#VSR
Sampling rate selection (ADPCM or PCM).
#VSS
Silence detection tuner (voice receive, ADPCM).
#VTD
DTMF tone reporting capability.
#VTM
Enable timing mark placement.
#VTS
Generate tone signals.
#VTX
Voice transmit mode (ADPCM or PCM).
7.3.1 Global AT Command Set Extensions
The AT commands in the following section are global, meaning that they can be issued in any appropriate mode (i.e., any
#CLS setting).
For consistency, the command set is divided into action commands and parameters (non-action commands). Those
commands which are action commands (i.e., those which cause some change in the current operating behavior of the
modem) are identified as such, and the remaining commands are parameters.
All voice commands that can have a value of 0-255 will not respond error if a value above 255 is entered; the resulting value
will be the value entered minus 256 or 512, etc.
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