Or just get a phone cord that is intended to connect a phone to a jack.
The wall side will have a modular jack, and the other side has spades/lugs for the end.
Connect the spades to the phone.
Mount the phone to the wall NEAR the jack, just as was done before jacks. Then plug the modular jack side into a wall or baseboard jack.
Hope this helps.
~It will have three wires and will connect to three terminals in your phone.
This confuses me. The three wire system was out-of-style a LONG LONG time ago.
Wall wires:
Red+Green= Line 1
Black + yellow= Line 2
Therefore with a one-line system and phone only two conductors are needed, unless I'm mis-infomred or not understanding what your phone is..........