Is it possible to play music during calls so that the partner can hear it ? Android

Question

I\'m trying to make and app like Call Cheater(Originally developed for Symbian OS)

Is it possible to play a music during a phone conversation where receiver and call

Answer 1

No, It is not possible. But if you want to dig it more, then you can visit Using Android phone as GSM Gateway for VoIP where author has concluded that

It's not possible to use Android as a GSM Gateway in its current form. Even after flashing custom ROM because they also depends on proprietary RIL (Radio Interface Layer) firmwares. Hurdles 1 and 2 (API limitation) can be removed because the source code is available for the open source community to make it possible. However, the hurdle 3 (proprietary RIL) is dependent on the hardware vendors. Hardware vendors do not usually make their device drivers code available.