This is configurable with the Advanced Settings Tool in the Unity Tools Depot. There is a setting called "Conversation - Mark messages read upon hang-up". Set this to 1 and messages will be marked as read when you hang up.
I just realized that starting with 4.2, this setting is configured on the subscriber or subscriber template. In Unity web admin, go to the Conversation section of a subscriber or subscriber template. There is a checkbox that says "Mark a message as saved upon hangup or disconnection". If you need to set this option for multiple existing subscribers, use the BulkEdit tool in the Unity Tools Depot.
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.