I looked at the datasheet for both the MX200 and MX200 G2, and they both said they support H.323. So, you should be able to do this, just be sure to open the appropriate ports in the firewall and set the H.323 ports to be static instead of dynamic.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.