On the conversation page for the subscriber in the SA you can select to address subscribers by extension or by first name then last name or by last name then first name. You can use the BulkEdit utility to change the default addressing option for groups of users if you need to.
You can't switch between first name or last name first over the phone interface - only between name and ID addressing.
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.