I cannot speak for UC500 as I never worked with it, but since you mention CME the answer is you can absolutely access it, all you need to do is build voip dial-peers which point to the remote CME that have matching POTS dial peers pointing to the local PRI trunks. I would imagine you should be able to do the same with UC500.
Well, you did not specify your requirements, what do you want to send out of remote PRI?
For example are you trying to do least cost routing, where you want to send calls local to the remote location via this trunk to save on LD charges? If so you need to define explicit dial peer that matches the area code and point to remote router, let's assume you need to send all 312 are code number out remote location, you would define the following dial-peer
dial-peer voice X voip
destination-pattern 91312....... (assuming 11 digit dialing and using 9 as off net access code)
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.