I think I was having a problem where I could try and search for names, but the phone would just say searching. I checked under Enterprise Parameters to see the Directories URL and it was using the CM Hostname. I changed the hostname to the IP address and all Corp Directory works the from 7921.
Turns out my wired phones were able to reach the DNS server, but the Wireless Voice VLAN could not reach our DNS Server.
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.