4 Core Telephone Cable Extension Cord Cable LINE Wire are produced with Standard RJ-11 Plugs and bare copper Telephone Cable. Some of the Telephone Line, for example, Telephone Flat Cable could be produced coiled. The cable are made from high quality material to last in weather conditions. For use with telephones, fax machines, modems, answering machines, etc. Connect two phone devices together or connect a phone to a wall jack. Telephone cable also include 8 Cores Telephone Cable and 6 core and 2 core as well as 6 core wire telephone cable.