am 06e55977: am 907f6f1d: Merge "Fix SipSessionGroup from throwing ConcurrentModificationException" into gingerbread

Merge commit '06e559779edd93a83100824b36c9bf67a27db178'

* commit '06e559779edd93a83100824b36c9bf67a27db178':
  Fix SipSessionGroup from throwing ConcurrentModificationException