Fix sip_audio_session.py not quitting when using bonjour

darcs-hash:20090326121054-58103-9ace87e84778dec29ae359df5307993b8457b2a0
Changed expected value for changing a setting to None in sip_settings

Ignore-this: 5a504e38d84d584371af347a638e7dfd

darcs-hash:20090326121514-1e3d8-e586375a2ac94ba75143c66b1d5732823c4c5554