title: InCallService or ConnectionService for Linphone-Android
body: <p>I am working on a Linphone-Android application - and would like the voice calls to appear in the native UI/dialler (a la CallKit in iOS). I believe the two permissions are:</p>
  <ol>
  <li>InCallService</li>
  <li>ConnectionService</li>
  </ol>
  <p>Has anyone done this before? Any tips/watchouts please?</p>