[Kamailio-Users] Getting Error 477 while registering Softphones

hello, i'm getting Error 477 while registering a Softphone from outside my domain i added my domain, tayeb.blogdns.com to the domain name variable, sip_domain in kamctlrc.conf created the DB, started, and added user 1000 and 1001 in registration: for internal use, i use 192.168.1.3 (Kamailio IP Address) and for external use i use my domain for internal, is working corectly but while i register a external softphone is getting Error 477 what is this error message? how i can fix it? please try to help me, any help is welcome __________ Information from ESET NOD32 Antivirus, version of virus signature database 4327 (20090811) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com