Specifications

GT300 @Track Air Interface Protocol
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4.9. Remote Volume Control
The backend server can use command AT+GTRVC to control the volume of the voice call and
ring tone. It can control the volume of normal phone call, hands-free call and call via headset.
It can control the volume of normal ring tone and ring tone via headset.
Example:
To control the volume of the voice call and melody playback, configure the terminal with the
following command:
AT+GTRVC=gt300,3,5,3,4,2,0008
By this command, the volume of the normal phone call is set to “3” ; The volume of the hands-fre
call is set to “5”, and the volume of the phone call via headset is set to “3”. The volume of
normal ring tone is set to “4” and ring tone via headset to “2” for the headset.
The configuration is done when the backend server receives the following message:
+ACK:GTRVC,135790246811220,0008,20090112104725,000A,0102070202