Re: Cat5 and NID
It sounds like you are talking about a telephone barrier box not a NID. They are usually set up for two incoming lines. You have one incoming line which is connected to one set of two red/green output screws. In that case you would use on set of wires in each Cat5 cable connected to the red/green screws and the other end connected to the telephone receptacles. As an example use the blue/ white blue pair from each cable and hook the blue to the red screw and the white-blue to the green screw.
Be sure you live your life, because you are a long time dead.-Scottish Proverb