You don't need to add the phones in site A to the callmanager in site B. All you need to do is configure Each callmanager as a h.323(interclustertrunk) device of the other then point route patterns at each callmanager that. So if site B has extensions in the 2000-2099 range. Create a route pattern of 20xx and point it at the ohter callmanager and do the same thing to call back the other way.
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.