So you have a gateway that is setup with two control protocols, H.323 to handle calls coming from and to your ISDN circuits and SIP to handle calls coming from and to your SIP circuit, all this is then also setup in CM as two entries, one H.323 gateway and one SIP trunk. Am I right in that understanding? If so then you should not need to do more than what you outlined, given that both of these connections are operational today.