I can't help, but I'll give you bonus points for the scariest and most-illegal sounding SOPW question ever :)
I think the only way you are going to be able to detect a FAX is by trying to speak a bit of FAX protcol and see if it "likes" you and returns FAX-like acknowledgements. Or maybe FAXEN don't like certain aspects of modem protocol and hang up. Who knows.
Good luck with it, sounds like a fun task.
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