title: Playing an pre-recorded audio file to somebody over a call
body: <p>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 atleast that is what i have heard/seen on the internet.  My Question is this, if this is truly the way it is, how is prankdial accomplishing this?</p>
  
  <p>Many similar questions have been asked but they all seem really old, so i was wondering if anybody has gained any more insight about this.</p>