title: Accessing raw phone call data on Android
body: <p>I'm working on an app to cipher the audio stream sent via a voice call. Not VoIP call, just regular GSM phone call. </p>
  
  <p>I have put together all of the core Android code classes to recreate the whole process of making a phone call but I always hit a dead spot where I can follow no longer.</p>
  
  <p>Essentially, what need to know is: Where does Android manager the data that is being sent through a phone call. I mean were the bytes sent are.</p>
  
  <p>Thanks ahead.</p>