title: sending constant data to phone-call activity
body: <p>I am working on an android app that intiates a phone call, and then goes to some other intent activity.
  Now what I want is that how can this new activity send a text or audio to the phone_call activity, and this audio be heard on the receiver end of the call. </p>
  
  <p>I have to deliver this tomorrow and am completely stuck. In need of help. THanks</p>