Our 14ft 4 conductor RJ11 / RJ14 telephone line cable is designed for use with both Business and Home telephone systems. These heavy duty cables will work with 1 or 2 line phones. Plug and play ready for fax lines, modems, cordless or standard phones. pin2 -- pin5 (black)
pin3 -- pin4 (red)
pin4 -- pin3 (green)
pin5 -- pin2 (yellow)