From what Ive gathered from your post it looks like you want to encrypt the voice from the phone itself. I dont think that feature is available in the phone itself. I would suggest using softphone with the vpn client software and encrypt the IP that way. Or if the first hop isnt an issue, at least encrypt it from the gateway to the remote site or PSTN. I havent tried it myself but maybe someone else here has.
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.