House Phone Line Wiring - YouTube Jun 24, 2017The wiring or home telephone service (also known as POTS or Analog) is fairly simple. The most important part is to keep the wire colors consistently on the same terminals. Do it yourself home telephone wiring. Wiring your phone jack. If you have one with the new color code the white/blue and blue/white terminals are the first phone line. 2) The second pair of terminals either yellow and black or white/orange and orange/white is the second phone line. This is only of use if you are using a 2 line telephone, and continues with the color code for 3..