am 51028569: am 1180f2a0: Merge "Remove ringtone API from SipAudioCall." into gingerbread

Merge commit '5102856947595cffc1cceb11b9e4c5baf70b2e82'

* commit '5102856947595cffc1cceb11b9e4c5baf70b2e82':
  Remove ringtone API from SipAudioCall.