Install it on a machine on the same network that has access to the CUC server. Make sure to view the help file as there may be a setting you need to add to the CUC server for this tool to work with it. Once you get that working, find a user with an empty mailbox, start the port status monitor and leave a new message for that user. See if the MWI ports on the port status monitor actually dial an MWI ON for that user's extension. If so, CUC is NOT the problem. The MWI is getting lost after leaving the CUC server and it's a partition/css problem with CUCM.
These are the paths to get to each CCX logs through CLI. They may be helpful if you are having issues accessing RTMT or downloading logs through it.
If you want to download them you have to prefix "file get " and you can add one of the options (re...