I'll assume, given the nature of the question, that this is a voice-mail only deployment. Are you looking to get IMAP connection to Unity, configure it as Unified Messaging integrated with corporate message store, or get SMTP message notification?
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.