Merge changes I7efff4f2,I1631ee20,I14d9886a,Ic2858920,Iff588130,I37ba9d83 into ginger...

* changes:
  SIP: Make SipAudioCallImpl use SimpleSessionDescription instead of javax.sdp.
  SDP: Add a simple class to help manipulate session descriptions.
  RTP: Add log throttle for "no data".
  RTP: Update native part to reflect the API change.
  RTP: Add two getters to retrieve the current configuration from AudioStream.
  RTP: Extend codec capability and update the APIs.