Could you please provide the detailed CCM traces for a non-working test call, with calling number and called number and time of call? As it is SIP trunk, you can use 'Session Trace' feature to check the calls and logs.
Please crosscheck if partition of the phone DN is added to the inbound css (CSS_National)
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.