Double check with the fax card if its really connected, coz usually when you cannot access to register key this means your fax card is not recognized yet, just unplug the fax card and plug it again, and check the status.
make sure you plug the phone line where it says line not T1 ot T2
and to know if your line work, hit fax buttom and then look to the screen and touch onhook buttom, if you heard the phone hook sound this means is working fine, if not check the fax card.
Regards
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