title: How to make a self phone call which plays mp3 when answered?
body: <p>I'm trying to make an an android app whereby if the user answers the phone call the mp3 file will start and the voice of the call will be the mp3 file. </p>
  
  <p>Meaning when the app is triggered, it'll make a phone call to itself and when you answer it, the mp3 file will act as the voice behind the phone call.</p>
  
  <p>I know how to make a simple phone call app, but I can't get it to call itself nor making the mp3 file play as the voice from the other side of the phone. Any guides on how to perform this?</p>