Updated TODO

darcs-hash:20090402180215-58252-8366f34aef6576b02b4db7312bc1fb55d5e27d50
Deal with "code" not always being in SIPAccountRegistrationDidFail data..

...in sip_audio_session.py

darcs-hash:20090403082917-58103-d854bfd4ff1813d0bc0bb14ccb6ffa348c469c6e