title: Play audio over an active phone call, so other end can hear it
body: <p>A and B are talking on the phone. During the call, A presses a button that pulls audio from a resource and plays it over the phone call to B. </p>
  
  <p>Is this possible using the Android framework? The goal is for the person on the other end of the call to hear the audio.</p>
  
  <p>If it's not possible, is it a hardware limitation or a limit of the Android framework?</p>