You can choose either of these two methods of call admission control, but you cannot combine them in the same Cisco CallManager system. If your system does not contain IP WAN links with limited available bandwidth, you do not have to use call admission control.
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.