I would guess it is more of a phone issue, ala Dial 9 to call out.
But a guess is worthless, fax is just a phone call, so listen to it send.
At the printer login as admin via username = admin and password - 1111
Machine Status > Tools > Service Settings > Fax Service > Fax Volume.
Crank up the volume and send a fax, you will most definitely find out whats up with it.
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for posts that resolve your issues. Your feedback counts!Joe Arseneau