I removed the cover for the phone jack and remove the phone line connecting it. Grabbing your new dual phone jack plate for the replacement. I used the jack on top, for my analogue phone line and the bottom jack for my ISDN line. Hooking these wires to the new jack is easy. 

1. Unscrew the screws about halfway using a Phillips screw driver.
2. Remove about 1 inch of insulation from the phone wire.
3. Remove about 1/2 of an inch of insulation from the 4 wires.
4. Match the wire colors to the wires on the jack.
5. Wrap the phone wire around the screw and tighten it down.
6. Repeat for both lines.

Wiring you wall plate.

Wiring your wall plate, close-up.

Secure your wall plate.

Now we need to run a wire from the phone jack to the ISDN router. 

1. With your phone wire, cut a desired length. I needed about 6 feet.
2. Trim the insulation off one end of the phone wire. This will be about 3/8 of an inch.
3. Align your wires in a row by colors from left to right:
   BLACK RED GREEN YELLOW
4. Grab one of your RJ-11 Jacks
5. While holding the  phone wire in one hand, hold the RJ-11 in the other with the tit facing down.
6. Push the phone wire into the RJ-11. Be careful not to get the order out of place. Be sure you push the wire in as far as it will go.
7. Use your crimpers to crimp the RJ-11 plug.

Now we are finished with one end. 

1. Trim about 1/2 of an inch of insulation off the other end of your wire.
2. Arrange your wires from left to right in the same order as above: 
   BLACK RED GREEN YELLOW
3. This is where you must be careful. The RJ-45 is made for 8 24 gauge wires. You will be using the 4 in the middle. You will have two blanks on each side.
4. Push the wire in the RJ-45. Be sure the wires are in the same order.
5. Then crimp the wires.

RJ-11 End

RJ-45 End