Assuming the basics - you have separate subnets on vlans 120 and 125 with routing between them. You also have the DHCP scopes for both vlans set up correctly with the router and option 150 set on both and CallManger on the appropriate vlan/IP subnet - logically it should be 125
I believe the correct set up should be, with the IP phone beinga switch in its own right runing 802.1q:
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.