Do it yourself home telephone wiring. Wiring your phone jack. For some reason most of today’s phone jacks still use the old color code, so unless you happen to get a phone jack that reflects the new color code, the above details and the following rules apply. 1) The terminals that have the red and green wires connected to them is the 1st phone line. DIY Home Telephone Wiring - Easy Now that you have your phone jack wiring complete, you must now hook the telephone wire up to the connecting block. Again, depending on the age of you home, the conecting block could be as simple as two screws. A red and a green. Connect the red wire (or blue/white) to the red side and the green (or white/blue) to the green side.