Made sip_auto_publish_presence's code based on publication status

darcs-hash:20090115142930-1e3d8-cd6bdf9da7e4c681ecd1535210e49a9d1d03bd74
Made sip_audio_sessions's return code based on call status

darcs-hash:20090115144121-1e3d8-0ee525a4a5fb9fe17da27069af8afa0b0cd1a0ce