X and Y can't be different. According to H.323 standard:
"6.2.8.2 Logical channel signalling
...
Logical channels shall be opened using the following procedure:
...
If a corresponding reverse channel is opened for a given existing RTP session (identified by the RTP sessionID), the mediaControlChannel Transport Addresses exchanged by the openLogicalChannel process shall be identical to those used for the forward channel. "

Anatoli

Medhavi Bhatia wrote:

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 inthat case ? thanks - Medhavi.