Playing an pre-recorded audio file to somebody over a call

Question

I understand that even though the AudioManager.STREAM_VOICE_CALL is available in the SDK for android, it is not actually been used to play a pre-recorded audio file, or atle

Answer 1

My Question is this, if this is truly the way it is, how is prankdial accomplishing this?

It is impossible. Android applications do not have access to the in-call audio stream. AudioManager.STREAM_VOICE_CALL is for volume control.