You can use cor lists to do this, or you can use translation patterns.
The idea is for the fax machine to dial a normal number, the router will add a prefix for routing, match the appropriate dial peer, and then strip the prefix before sending it out. This is transparent to either end.
It would look something like this:
voice translation-rule 1
rule 1 /\(.*\)/ /9999\1/
voice translation-profile 1
translated called 1
dial-peer voice 1 pots
translation-profile incoming 1
dial-peer voice 2 pots
Call from FXS hits dial peer 1, router adds 9999. Router searches for a dial peer that matches the 9999.* number, finds dial peer 2. On a pots dial peer, any number explicitly matches is stripped, so the number sent out is the original dialed number.
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