Updated sip_message.py script to use notification system and new notification names

darcs-hash:20090205144504-58103-c64d342466aae3a0080258e45f701956a4b5e994
Adapted sip_audio_session.py script to notification system and new notification names

darcs-hash:20090209161648-58103-88bdf73ea76445bcdfcc090e3f8ba36f6a268a55