People, I've setup Asterisk in a basic mode with SIP protocol. In the future I wanna connect several offices each one with an own Asterisk server, using IAX because I read it has no firewalling problems using just one UDP port for control and data -aming other advantages- . SIP has NAT problems I know. Do you recommend the use of IAX instead of SIP for users and among several Asterisk's ??? Does the IAX implementation take any extra considerations than SIP ??? Any initial guide for IAX - Asterisk configuration ??? Thanks a lot, Alejandro