Updated sample configuration file

darcs-hash:20090215112747-58252-22e0302fa393782f4a9c8e5d4d691048a6810a1b
Added '?' key command to display control keys in sip_audio_session

darcs-hash:20090216123232-1e3d8-da69959dab322239d6ba563380e787fca95962d3