Specifications

GV200 @Track Air Interface Protocol
TRACGV200AN003 – 43 –
3.2.15. Voice Monitoring
The command AT+GTMON is used to set stealthy voice monitoring. After the command is
executed, the device will send the message +RESP:GTMON to the backend server via SMS.
 AT+GTMON=
Example:
AT+GTMON=gv200,1,+8613812341234,5,0,,,,,000E$
Parameter Length(byte Range/Format Default
Password 4 – 6 '0' – '9' 'a' – 'z' 'A' – 'Z' gv200
Mode 1 0–3 0
Stealthy Phone Number <=20
Stealthy Microphone 2 0 – 10 5
Stealthy Speaker 1 0 – 7 0
Reserved 0
Reserved 0
Reserved 0
Reserved 0
Serial Number 4 0000 – FFFF
Tail Character 1 $ $
 <Mode>: Stealthy voice monitoring mode.
 0: Disable stealthy voice monitoring.
 1: Open stealthy voice monitoring when calling phone number specified in <Stealthy
Phone Number>.
 2: Open stealthy voice monitoring automatically when a call is incoming.
 3: Open stealthy voice monitoring when calling phone number specified in <Stealthy
Phone Number> and when a call is incoming.
 <Stealthy Phone Number>: The phone number to make stealthy voice call.
 <Stealthy Microphone>: Set the volume of the microphone, 0 means disable microphone.
 <Stealthy Speaker>: Set the volume of the speaker, 0 means disable speaker.
The acknowledgment message of AT+GTMON command:
 +ACK:GTMON,
Example:
+ACK:GTMON,040100,135790246811220,,000E,20090214093254,11F0$
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