Hi develop team, When the sip user account is NOT create in Freeswtich, and the number is in the dial plan, freeswitch will respone "Goodbye", NO more info. Suggest to response, "NO such user, Goodbye". 2013-09-24 11:19:22.163081 [NOTICE] mod_loopback.c:945 Pre-Answer loopback/voicemail-a! 2013-09-24 11:19:22.163081 [NOTICE] mod_dptools.c:1253 Pre-Answer loopback/voicemail-b! 2013-09-24 11:19:22.163081 [WARNING] mod_voicemail.c:3452 Can't find user [3666@172.0.0.10] Thanks! 2013-09-24 sparklezou