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Chapter 3 – Voice Commands
+VTS Examples:
Example 1
This example illustrates tone generation without using any null elements.
The command example is followed by a description of command execution.
AT+VTS= {!,30},1,2,[1000,1300,50],!,{*,6},[800,1300,50],9
1. Hookflash with a duration of 300 ms.
2. Play DTMF 1 with a duration given by the +VTD command.
3. Play DTMF 2 with a duration given by the +VTD command.
4. Play tone pair at 1 000 Hz and 1 300 Hz with a duration of 500 ms.
5. Hookflash with a duration given by the +VTD command.
6. Play DTMF * with a duration of 60 ms.
7. Play tone pair at 800 Hz and 1300 Hz with a duration of 500 ms.
8. Play DTMF 9 with a duration given by the +VTD command.
Example 2
This example illustrates tone generation using null elements.
The command example is followed by a description of command execution.
AT+VTS=1,2,[1000,1300,50],[800],9
1. Play DTMF 1 with a duration given by the +VTD command.
2. Play DTMF 2 with a duration given by the +VTD command.
3. Play tone pair at 1000 Hz and 1300 Hz with a duration of 500 ms.
4. Play tone pair at 800 Hz with a duration given by the +VTD command.
5. Play DTMF 9 with a duration given by the +VTD command.
Example 3
This example illustrates tone generation using null elements and periods of silence.
The command example is followed by a description of command execution.
AT+VTS=1,[,,50],2,[ ],9
1. Play DTMF 1 with a duration given by the +VTD command.
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.
Command
Description:
Default:
Result Codes:
+VTX
Start Modem Transmit (Playback)
This command causes the modem to start the voice transmission process.
Syntax: +VTX
None
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.
Command: +VGR
Description:
Default:
Result Codes:
Report Commands:
Command: +VGT
Description:
Values:
Default:
Report Commands:
Voice Gain Receive (Record Gain)
This command causes the modem to set the gain for received voice samples.
Syntax: +VGR=<gain> 0 (only valid number) selects automatic gain control.
0
OK <gain> = 0.
ERROR. Otherwise, or if not in Voice Mode.
+VGR? Reports current or selected values.
+VGR=? Reports supported range of parameter values.
Voice Gain Transmit (Playback Volume)
This command causes the modem to set the volume level.
Syntax: +VGT=<level>.
<level> Decimal number corresponding to the volume level. Range = 0-255.
128
+VGT? Reports current of selected values.
+VGT=? Reports supported range of parameter values.
Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)
31
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