Hi Justin!
I am not aware that there is a generic issue with TC6.2/VCS X7.2.2 and MCU 4.4.
Espeically if I hear about h323 strangeness looking at the firewall is always worth the try.
Check that no Layer-3 features are enabled, they can hide on firewall, L3-ALGs but even
on routers and switches. Also that your network ports are properly open and your configuration is ok.
Do you have some more info how the call flow looks like are all on the same vcs-c or where are
the units registered?
What did you upgrade from 6.1.2? A factory default reset would have been my next suggestion.
Its always worth looking into the log files, and I am not sure if you had seen the tc6 troubleshooting
guide:
http://www.cisco.com/en/US/partner/products/ps11327/prod_troubleshooting_guides_list.html
If this did not help you and you did not get a better answer and you have a service contract
consider of escalating the case as a service request to Cisco Tac, you can do it directly from this case
on the right upper side of the menu.
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