Fax: Any XMedius users know an effective way of blocking spam/junk faxes?

I work in an educational environment where I inherited the XMedius system from a previous employee. As the fax admin, I deal with junk faxes daily for several hundred users. My predecessor has a system set up where we had a junk email address created and created incoming routing rules for any junk faxes with custom ANI or CSIDs.

This has been working for the most part, but my issue is that I now have nearly 40 direct routing rules all for junk faxes, and they're clogging up my routing table. And to make matters worse, the junk faxes are getting more clever, using randomized characters in the CSIDs like "Œ€CôÛV" (the characters don't even translate to copy/paste here). Even if I were to construct a routing rule for that, the next junk fax would use a different set of randomized characters.

I've searched through the XMedius administration guide, and the closest thing I could find was using OCR as a filtering tool to route faxes that contain "keywords". But again, it's just something that clogs the routing table, and blocking a fax based on keywords alone is risky since we deal with medical, financial aid, enrollment, police reporting, etc. The differing areas that use XMedius might occasionally use a forbidden keyword, so I can't really rely on that.

In my searches, I saw that FaxTalk advertised a feature for filtering spam/junk faxes. It's such a huge problem, I'm surprised that XMedius doesn't feature the same function. So this leads me here to the networking subreddit. I would like to improve the efficiency of spam fax filtering, but I'm limited to the XMedius platform. Aside from having to create dozens of direct routing rules, does anyone have any advice or even possible solutions to install a more effective filter?

Any help would be greatly appreciated.