Usually the toll free number resides at the service provider and they just translate that number into one of your DIDs. You can either look through documentation or call the service provider to ask which 1800 numbers map to which DIDs. From there it sounds like you'll need to investigate call handlers in your voicemail system correlated to that DID.
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.