am dc296b0d: Merge "SipService: reduce the usage of javax.sdp.*." into gingerbread

Merge commit 'dc296b0d4bd6fef8764c10fb4cd59c85bc5186f6' into gingerbread-plus-aosp

* commit 'dc296b0d4bd6fef8764c10fb4cd59c85bc5186f6':
  SipService: reduce the usage of javax.sdp.*.