Telenetics 56 - Manual (Page 194)

AT Commands
Page 186
2.
Play silence with a duration of 500 ms.
3.
Play DTMF 2 with a duration given by the +VTD command.
4.
Play silence with a duration given by the +VTD command.
5.
Play DTMF 9 with a duration given by the +VTD command.
+VTX - Start Modem Transmit (Playback)
This command causes the modem to start the voice transmission process.
Syntax +VTX
Reporting Current or Selected Values
Command: +VNH?
Response: <hook>
Example:
0 For the default setting.
Reporting Supported Range of Parameter Values
Command: +VNH=?
Response: (<hook>
range)
Example: (0-2)
Result Codes
CONNECT The modem accepts the command.
ERROR The modem is not connected to at least one off-hook telephone
line or one non-telephone line.
+VGR - Voice Gain Receive (Record Gain)
This command causes the modem to set the gain for received voice samples.
Syntax +VTX
Defined Values
+VGR=<gain> 0 (only valid number) selects automatic gain control
Reporting Current or Selected Values
Command: +VGR?
Response: <gain>
Example:
0 For the default setting.
Reporting Supported Range of Parameter Values
Command: +VGR=?
Response: <gain>
range
Example: 0
Result Codes
OK <gain> = 0.
ERROR Otherwise, or if not in Voice Mode.