Check with your Network boffins that there is no H.323 Packet Inspection happening along the chain in either direction. This can lead to errors if it is occuring.
Then you can get them to look at the links between your two sites to check for any congestion, and to then configure appropriate QoS settings to give your video traffic some priority if that's the problem.
Could also be a speed/duplex mismatch somewhere along the line between switches - I've seen this one a few times before.
Your network folks should be able to interrogate the devices along the chain to see where the problem may be.
Please remember to rate any responses and mark your question as "answered" if appropriate.
Wayne -- Please remember to rate responses and to mark your question as answered if appropriate.
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