What material is used for telephone wires?
Telephone line
In most cases, two copper wires (tip and ring) for each telephone line run from a home or other small building to a local telephone exchange.  There is a central junction box for the building where the wires that go to telephone jacks throughout the building and wires that go to the exchange meet and can be connected in different configurations depending upon the subscribed telephone service.  The wires between the junction box and the exchange are known as the local loop, and the network of wires going to an exchange, the access network.