How external controller knows that call is connected?

Technical Subjects
1

Hello guys,
I am building a Portable gps tracker with calling functionality.
I have implemented call function able to receive call from another device.
Now i want to know that when i send command to make a call from controller to GSM, how the controller knows that call is connected?

2

Hi Nishikant:
You can check it with this AT command:
AT+CLCC
The following is the instruction explanation of the GSM module for your reference:

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3

Thanks for the reply @Winnie.Xi-Q , I’ll go through this.