Added srtp_active attribute to RTPTransport to query if SRTP is actually being used

darcs-hash:20081203174632-58103-84e9f08b01241717255dd102dbeb89d24fc20a89
Changed SRTP console output in sip_audio_session.py

darcs-hash:20081203193038-58103-d255e7a9c1822e726e5601843db407c1f46995e6