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Tools and material
The right length of cable, the jack itself, plugs and screws to attach it to the wall, staples to hold the cable, and if the cable runs outside, a hammer, screwdriver, cutter and wire-stripper. Plus, a drill with a fine-grade bit to make holes in the wall.

Planning the job
oï¿½It is all as easy as holding, nailing and screwing in. But to save time and headaches, think first from where and in what direction you want the new wire to run.
o In what way will you minimize the amount of wire you need? If the wire has to run through a room, where will you drill, through the wall or the doorframe?
o Even though this is not a major job, you must consider what is the shortest and most appropriate path for the wire.
o Telephone wire is thin and easily hidden with paint, but you might want to embed it. If so this will involve more work.
o To calculate the amount of wire you need, use a tape to measure the distance from the place where the new connection begins and the spot where the new jack goes. Always buy a bit more cable than you think you need, in case you make a mistake during the installation.

The start of the line
o Your house probably has a small, individual terminal where the line from the telephone company ends. From it your own personal telephone installation begins.
o This device is known in Spain by the initials PCR (Punto de Conexiï¿½n de Red, or Network Connection Point) and installing it is up to the telephone company. That's not the case with the supplementary jack; its installation and maintenance are both up to you.
o The PCR has a switch with two positions: normal and test. Set it on test before making the new connection.
o If this is the first time you have installed a new jack, the wires will come out of positions L1 and L2 of the PCR.

First, the cable
oï¿½Start by stretching the wire out from the plug from which you are going to make the connection.
o If you do this right on the surface of the wall, do so in the most discrete place possible. Next to the baseboard is good.
o If you have to make a hole to go through a wall, use a long drill bit and be aware of what is on the other side of the wall.
o Attach the cable with metal staples (use a stapler) or staple-nails that will press on the cable with a plastic head.
o Do not leave more than half a meter between the nails.

Then, the new plug
o Mark the points and drill to make holes where you will hold the new jack
o Put the plugs in place and screw in the internal part of the plug, depending on the model
o Leave the cover off to make the connection.

Make the connection
o Remove the cover from the existing jack, either unscrewing it or prying it with leverage, depending on its characteristics.
o Before stripping it, place the new cable through one of the holes of the jack. If it does not have such an opening you will have to break off a piece. Do it in the most discrete place possible.
o Strip the cable and each of the ends of the existing cable. Hold them in place either with pressure small screws. Donï¿½t cover up the new jack until you have confirmed it works properly.
o Proceed in the same way with the new jack. One of the wires will go to L1 and the other to L2. If these are marked as such, look for the terminals of the red wire and the green wire. If this set-up does not work, change the wires or the other terminals.
o Activate the cover of the PCR, placing it in normal position, and check your work. If the result is not as expected, repeat the steps until you find the error.

Our tips
o If you are going to do remodeling work, this is a good time to plan the distribution of your telephone wiring. Think about how many computers in your home will be connected to Internet, for example, or in which rooms you can have the quietest telephone conversations.
o Determine the number of new grooves you need to put in the walls or floor to accommodate plastic tubes holding the telephone wires.
o You can also extend the telephone line with small tubes or leads. They come in a variety of colors, are attached to the wall with adhesive or with small screws.
o From these leads you can also take the sockets you need for the telephone.
o There are also baseboards designed specifically to hide thin telephone wires.