title: iPhone (iOS4): is it possible to play music/sound during an active call?
body: <p>I want to allow user to switch to my app during a phone call and play some sound that the second person will hear.</p>
  
  <p>I see <a href="https://stackoverflow.com/questions/2137068/iphone-playing-sound-over-a-phone-call">here</a> that it was possible even before iOS4 and <a href="https://stackoverflow.com/questions/1931187/iphone-is-it-possible-to-play-a-sound-from-the-speakers-while-in-a-call">here</a> that no one knows how to do it.</p>
  
  <p>I will really appreciate if someone will spread some light on this issue.</p>
  
  <p>Thank you.</p>