I just did this for a customer last Wednesday. I have an IP 500V2 R9 to a 406 R3.2 tlpeter is absolutely correct with a h323 trunk and h450 on the 406. I also created a short code in the 406 to dial the extensions at the remote site. Using 1100 - 1199 for an example. Code is 11XX, the feature is dial, telephone number is a . and the line group ID is the h323 trunk you have created to the remote IPO.