That still doesn't help with the "other end". Then you would have to plug the phone into the one and only one correct jack on that harmonica. It's way too easy to have more than one phone on an extension with those. When that happens Partner phones will do something, and that's usually confuse the hell out of someone who doesn't know what's going on.
I agree with John, get someone who knows what they are doing to get the wiring working for you.
-Hal
