Smartphone as a GSM gateway for calls (sip trunk)
1141 USD 
The task is to create a SIP trunk for calls from a smartphone (like a GSM gateway)
The phone model, Android version, root access - I can adjust, I understand that it is impossible to support all phones.
You can choose a phone and install root access with the required version of Android.
Your task:
Write or use existing libraries on GitHub (example https://github.com/telon-org/react-native-gsm-sip-gateway)
to build an application that will connect the phone to Asterisk as a SIP trunk and outgoing calls will be made through the SIM card inserted into the phone with sound transmitted in both directions.
Additionally, support for SMS and USSD will be needed (we will discuss this after completing the call task)
I would be happy to hear the opinions of specialists in this field, if you are sure that it is impossible to implement with software, I will consider options for connecting additional devices (Arduino, Raspberry Pi, etc.)
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