Prettify incoming SIP URI printing in sip_audio_session.py

darcs-hash:20090220102740-58103-a087e52158d0d596eef74eba7aef9626c23e1d12
Added sound attributes to MSRPChat skelleton class

darcs-hash:20090220113146-58103-d09959a8742cdfb4c0a09a8c2be1e99748c0baa7