Hi, Telco can't deliver PRI to customer site so now we have to send/receive calls via a service provider H323 Gateway. Problem is that we will need to NAT everything in order to talk to SP's H323 Gateway. We are using: CUCM 6.1.2 --->Cisco 2821--->SP Network--->SP H323 Gateway Just wondering on the best way to achieve this or pitfalls to look out for? thnx charl