When third-party SIP phones get configured, the Cisco Unified CallManager database gets updated when the administrator uses Cisco Unified CallManager Administration. The administrator must also perform configuration steps on the third-party SIP phone; see following examples:
Proxy address in the phone should be the IP or Fully Qualified Domain Name (FQDN) of Cisco Unified CallManager
Directory number(s) in the phone should match the directory number(s) that are configured for the device in Cisco Unified CallManager Administration
Digest user ID (sometimes referred to as Authorization ID) in the phone should match the Digest User ID in Cisco Unified CallManager Administration
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.