Hi Everyone, I'm trying to register FS with a gateway but it's been unsuccessful so far with the last message being 401 Unauthorized. I'm quite certain that the configuration in the gateway xml file is correct. The same username, password, etc has been used with X-Lite, Zoiper, Yealink, Cisco phones and it's been able to register. I've compared SIP traces of FS's registration and all the others and it seems that FS is not responding to the last 401 message from the other end even when the it's been challenged with a new nonce. What I found out was that the second 401 has an additional domain parameter as well. Are all the other clients being lenient and is not following the RFC or is this a bug in FS? SIP trace http://pastebin.freeswitch.org/15831 Configuration http://pastebin.freeswitch.org/15832 Mervyn