Yes. That appears to be the direction I need to go in. I don't have the time to address it until next week but this is the response I got from Xblue:

Based on your description of the issue it sounds like the voicemail system on the X16 has had some type of glitch or corruption. When I have seen this in the past a "Reset KSU" from the system setup menu will resolve the issue. Basic setup for AA ans delay, auto attend ring, date and time, etc will need to be reprogrammed once this process is completed. The telephones should remember their extension numbers and come back up however they will need to re-record their personal OGM's. We do have support options available on our website if the customer needs our assistance via the following link. https://store.xblue.com/product-support-options/

- Dave S. -

You can never appease your ideologue opponents.