am c6d1519e: am fb861523: Merge "Specification of codec specific data as part of the session description is now optional." into gingerbread

Merge commit 'c6d1519e549740abd56df7a98b5348bd9095ae46'

* commit 'c6d1519e549740abd56df7a98b5348bd9095ae46':
  Specification of codec specific data as part of the session description is now optional.