Hook up second telephone line, the theory
Assuming that everything is wired properly thruout your house i.
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Now run around the house plugging in your telephone to see if you have a dial-tone at each jack. As mentioned above, you should buy Cat 5 wire for all new phone wiring projects. Doing residential phone wiring is easy, however, and the local phone company's charges for this service are steep.
You can do your inside wiring yourself, or you can pay the local phone company or a third party such as an electrician to do it for you. Sharing two phone lines in non-twisted "quad" telephone cable will probably introduce some crosstalk.
This is no longer the case. You're under no obligation to do anything in return for me. This cable will probably have four solid conductor wires in it; one red, one green, one black, and one yellow or white.
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Given that you have to be consistent between the two ends of the wire, you might as well follow the standard. Four-strand wire supports up to two phone lines. If it's a fax or modem line, you may need to only to go to a certain jack. The first step is to perform a bit of what we call "Telephonic Archeology" by examining your present wiring to try to determine what goes where.
The following two diagrams show the color coding scheme for the old kind of wire. Best policy is to disconnect your house at the Tna knockouts dating Interface Device see below before working on wiring.
The main thing you're trying to determine at this point is whether all jacks have all four wires, and if they are connected. It doesn't really matter at this point. But they could also have replace your existing box with a new version that supports two or more lines, or they may have added a second DMARC box for the new line.
The only thing left is to make sure the black and yellow wires are carried all the way through and are connected in the target jack. Disconnect one green wire from the screw terminal. Also, for everybody, it's a bad idea to work on your phone wiring during thunderstorms. This phone is now hooked directly into the phone company's network.
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Just hook up the wires to the new line more later. This way, you can have a Line 1 jack right beside the Line 2 jack. When I moved, I hook up second telephone line unhooked my piece of wire and rolled it up for my next wiring project, and then I spackled over the hole I had drilled.
Installing extra lines can be a problem if you rent an apartment in a multi-unit building.
If you don't have a modular plug and jack, don't worry, you don't need them for this exercise.