Hi, I'm back with my question, maybe someone can help me: I want to use IAX on another UDP port (not the default 5036), because I have 2 Asterisks behind the same NAT. Changing the default port in iax.conf file from 5036 to 5038 and then calling using the syntax: exten => _8XXX,1,Dial(IAX/user:pass@195.3.32.191:5038/${EXTEN:1}) I get the follwing error in the Asterisk console: -- Executing Dial("SIP/351-24f4", "IAX/user:pass@195.3.32.191:5038/500") in new stack WARNING[1200825920]: File chan_iax.c, Line 1550 (create_addr): No such host: 195.3.32.191:5038 NOTICE[1200825920]: File app_dial.c, Line 488 (dial_exec): Unable to create channel of type 'IAX' == Everyone is busy at this time It is something wrong? It works like a charm with the default port, so it is not a user/authentication problem. Thanks, Dan