How to keep the call alive when app is closed or killed?

Is there any way I can keep the call working when I close the app by removing it from recent tasks?

Like I am in the call and during the call I minimize it and then remove it from recent tasks as well, then the call will obviously get killed as well but how can I keep the call working in app closed or killed stage.

My friend has achieved it in kotlin by initiating call in android service that way when app is killed then the service keeps working and call keeps working as well.

How to do it in react-native?

Related discussion over here.
For future reference.