Renamed key for SIP trace enabling in sip_audio_session

Ignore-this: ef318527ff4444b24f3532f9857dc873

darcs-hash:20090720162751-1e3d8-5a96b09d32ff6ee9544ab17f230b812fc6a1f13e
Always recompile pjsip to avoid broken installations when a new patch is added

darcs-hash:20090721092308-58252-5b8ed996bdb1c32cfa494c5f08fd62ed10d3923c