my 2 cents to point 2: if you can't call the mwi on and off numbers the phone or the line doesn't have the permission to do this. set the mwi numbers in a partition who is reachable for the phones or lines.
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.