RTCP port in H.323 logical channels

Hi, A question about mediaControl ports in Logical channels: Can an endpoint A open a logical channel to another endpoint B (in non fast start mode), specify control channel port X, and respond to B's OLC with a media control port Y, where X and Y are different ? Assuming the OLCs are for the same sessions. The H.323 spec specifies that X and Y must be the same for fast start scenarios. For a non fast start case, if they must be different, what is the behavior of the endpoint B in that case ? thanks - Medhavi.