title: Play audio into a phone call on Android in 2.3+
body: <p>Is it possible to play audio into a phone call on Android in 2.3+? For instance, I'd like to play an MP3 <strong>into</strong> a call that was placed from the device (not record the audio).</p>
  
  <p>I've seen people ask about earlier versions of Android and the responses are generally along the lines of "when the hardware supports it, the software will".</p>
  
  <p>So, do the newer Android devices/SDKs support this sort of audio routing? </p>