am b17eae9e: SipService: move event handling out of system server\'s main thread

Merge commit 'b17eae9e227475a323f61519abc8a7d35ddf8828' into gingerbread-plus-aosp

* commit 'b17eae9e227475a323f61519abc8a7d35ddf8828':
  SipService: move event handling out of system server's main thread