Comment #1 on issue 1891 by jean.deruelle: sipStack is null at ClusteredSipSession.updateSipSession()
http://code.google.com/p/mobicents/issues/detail?id=1891
This issue was updated by revision r14432.Actually due to Issue 1719, the stack is now at the service level, so the fix is a different, no need to iterate through connectors now
