Refactored MSRPChat.send_message

Ignore-this: 7eaddac4293c62f7aa9a0e16769d39b6

darcs-hash:20090813080241-1e3d8-1ff5efa6f3b86757e1e4366f9dcbcaf27b409cf9
Added improvements to sip_audio_session script

Ignore-this: b8ddfcb511cde46cf822be9f9b316a77

darcs-hash:20090817073014-1e3d8-51efd4fe727e547d380304876ab4a4b07907cade