It depends on how the phone is going to be used (by whom). Licensing is covered under either CUWL or UCL licensing model, so the easiest way would be to purchase either CUWL Standard or CUWL Pro license which will entitle the owner of the phone to use it along with voicemail account, single number reach, softphone, etc.
If this is standalone phone you can get Public Space UWL license for example.
Whoever you are purchasing this from should know how to quote it.
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.