It depends. The problem could be with Verizon or it could be equipment or configuration. You can use commands on the gateway to see if the call is ever reaching your equipment. For example, if this is a POTS line, you can type "show voice port summary" and see if the call ever hits the port. For a digital circuit, you can use "show call active voice brief".
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.