You should set a phone button template for 7914. Under device>device setting>phone button template, find 7914 or form it yourself and select the bottons and their features(there should be a button template named 1-7914 7960). Then, select this phone button templete under 7960 device settings.
I have CallManager 4.2 and when I try to connect the 7914 to the recepcionist 7960 with the 14 line template and the device configured for the Expansion Module the module lights up all buttons red and the 7960 shuts down. I've tried to connect the 7914 to a regular 7960 with only one line ant it kind of works. I get the speed dials to work but no button lamps.
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.