Getting a little rusty around the edges.... Need some help.

On my desk, is a plain old two button phone. Up until recently, it had two separate lines coming in (line 1 and line 2).

It got unplugged, and I'm trying to get it going again.

I think the wall socket is the old 4 conductor wire. Could a 4 conductor wire go to a two button phone?

If so, that explains why, since I put a 6 conductor splice on the cable, it doesn't match up right on the phone.

Is it likely that putting the old 4 conductor in would make things right??