Chapter 3 – Voice Commands
Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273G) 37
Speakerphone Commands

Command: +VSP Speakerphone ON/OFF

Description: This command turns the speakerphone ON or OFF.
Syntax: +VSP=<mode>
Values: <mode> Decimal number corresponding to the selected option.
0 The speakerphone function is OFF. Default
1 The speakerphone function is ON.
Default: 0
Report Commands: +VSP? Reports current of selected values.
+VSP=? Reports supported range of parameter values.

Command: +VGM Microphone Gain

Description: This command causes the modem to set the microphone gain of the speakerphone
function.
Syntax: +VGM=<gain>
Values: <gain> Decimal number between 0 and 255 corresponding to the gain.
1 The speakerphone mo de is ful l duplex.
Default: 64
Report Commands: +VGM? Reports current of selected values.
+VGM=? Reports supported range of parameter values.

Command: +VGS Speaker Gain

Description: This command causes the modem to set the speaker gain of the speakerphone function.
Syntax: +VGS=<gain>
Values: <gain> Decimal number between 0 and 255 corresponding to the gain.
1 The speakerphone mo de is ful l duplex.
Default: 128
Report Commands: +VGS Reports current of selected values.
+VGS=? Reports supported range of parameter values.