App to receive GSM phone calls remotely via internet

I am looking for a skilled app developer to create an app that allows me to receive GSM phone calls remotely via the internet. The following are the requirements for the project:

Operating System Compatibility:
- The app should be compatible with the Android operating system.

Preferred Programming Language:
- There is no preferred programming language for the app development.

Features:
- The app should solely focus on the functionality of receiving phone calls remotely via the internet and should not include any additional features.

Ideal Skills and Experience:
- Experience in developing Android apps.
- Proficiency in Java or Kotlin programming languages.
- Strong knowledge of internet connectivity and remote communication protocols.

Basic requirements for the project with example:
For example if the SIM card with mobile number 9999999999 is inserted in Phone A (Android xyz) device and if any xyz person calls the number 9999999999, the incoming calls should be received via internet or any mobile app like Zoiper etc or SIP server. Basically it's conversion of PSTN to VOIP or SIP. Via internet connectivity, the user should remotely be able to seamlessly answer all his incoming calls landing to his normal SIM card which may be functional at a different location.

If you have the necessary skills and experience, I would love to discuss this project further with you.