Thanks for your reply. I found a post that explained to do the following:

1: Open Block
2: EClass
3: Standard Template (may be different on yours)
4: Navigate to the 4th page with I believe CTRL-D
5: Outcall Authorizations
6: Set all to "N"

This blocks anyone coming in through voice mail and using the direct dial feature. This does not block transfers from within the company though. So if you transfer a phone call to an outside line, it will still transfer. It just will not do it through the voice mail system.

Does that just block what you detailed above? I will definitely get all the user voicemail passwords reset from the default.