GLOBALSAT TR-151 - Manual (Page 47)

2.5.4 How to make TR-151 to do Voice monitor function by GPRS?
You can send a command by GPRS server to ask TR-151 start the voice monitoring.
The format of command is following as:
$6,IMEI,Return_Phone_Number!
The table below explains the content of the command
Format Description
$ Start sign
6 Function code
IMEI IMEI code of the TR-151
Return_Phone_Number The phone number for TR-151 to call back and transmit the sounds.
! End sign
Note: The return phone number cannot be blank
TR-151 will send a command “$OK!” to the GPRS server to confirm it has received the
request. And then it will start to call back to the returned number written in the command. And
then you can listen to the sound or voice around TR-151.
Example:
You send voice command and make TR-151 call back to 626123456
$6,355632000166323,626123456!
Stop voice monitoring:
You can hang up the phone call to stop voice monitoring.
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