User`s manual

AT Command Reference Manual
1048 7-25
#VTX - Voice Transmit
This action command can be issued if and only if the modem is in the Online Voice Command Mode (indicated previously
with the VCON message), and is the switch to Voice Transmit Mode. #VTX is used when a voice file is to be transmitted to
the line, speaker, or handset. The #VLS command should have been previously issued to select the output source.
Parameters: None
Result Codes:
CONNECT When voice transmission by DTE can begin.
ERROR If #VLS =0 and output device not connected.
#VGT - Set Playback Volume in the Command State
The #VGT command allows the DTE to set the playback volume of the headphone and speaker outputs via the on-board
digital potentiometer while in the command state. The application can use #VGT=? command to determine the range of valid
values. The lowest value in the range means the lowest transmit level while the highest in the range means the highest
transmit level.
Parameters: n=128 to 131
Default: 129
Result Codes:
OK if n=128 to 131
ERROR Otherwise
Command Options:
#VGT=? Returns "128-131" if the external volume control is present, otherwise "128".
VGT? 129 (default).
<DLE><u> and <DLE><d> - Set Playback Volume in the Data State
The <DLE>u and <DLE>d action commands allow the DTE to adjust the playback volume of the headphone and speaker
outputs via the on-board digital potentiometer while in the data state. The application may embed the <DLE>u and <DLE>d
codes into the playback data to adjust the volume during playback. Each <DLE>u or <DLE>d will increment or decrement
the transmit level by 1 unit, respectively. Adjustment by a value greater than 1 may be achieved by transmitting a string of
the appropriate <DLE> codes. A string consisting of "<DLE>u<DLE>u<DLE>u<DLE>u<DLE>u", for example, would increase
the playback volume by a value of 5 units. The <DLE>u and <DLE>d codes can be used to adjust the volume within the
range of 128-228.
Command Options:
<DLE><u> Increment volume (transmit level) by 1 unit in data state.
<DLE><d> Decrement volume (transmit level) by 1 unit in data state.
7.3.3 Speakerphone Commands
Modem speakerphone models support full-duplex speakerphone operation. Hardware designs typically include an audio
codec which support functions such as music on hold, telephone/speakerphone conversation recording, and handset
recording through the audio codec.
This section describes the AT commands used by host software to enable speakerphone operation and route the audio
codec to and from the telephone line/handset. Also described is a procedure to operate speakerphone, headset, and
handset modes with VoiceView.
The #VLS=6 setting selects speakerphone mode while in #CLS=8 or +FCLASS=80 mode. Speakerphone operation is
entered during Voice On-line (VCON) mode after completing dialing (ATD) or answering (ATA).