It's difficult to get this info, there are no CLI commands I know of to actually show you.
I guess if you've configured it for a full PRI group rather than a partial PRI the service provider should have allocated all the channels.
You can test this by changing the ordering (TOP DOWN or BOTTOM UP) in CallManager (if you're using MGCP) or by busying out the ports (in CallManager service parameters), or by changing the PRI-group timeslots on the router.
Then debug the ISDN L3 on the router to monitor the output.
Other than this I don't think there is a way to show you what channels have been allocated by the provider.
..if anyone else has any ideas though I'd like to know?
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.