Is Line 144 used by or for anything else other then the Fax machine. I fLine is only used for the Fax, then just connect the Telco line from the Demarc to the Fax machine without going though the BCM and then you will be able to dial 16214234567. Oh and thak the ATA off.
This is a Signature and not part of the answer, it appears on every reply.
This is an Analogy so don't take it personally as some have.
Why change the engine if all you need is to change the spark plugs.