RJ11 to RJ45 BT Telephone Convertor Coupler 4P4C Tailed Cable
Many analogue phones are fitted with an RJ11 connector. It's easy to insert an RJ11 plug into an RJ45 socket and it should work for a voice connection if the other end of the link has the right wiring or the correct adapter.
The right way to use an RJ11 connector in a data cabling system is use an RJ11 to RJ45 adapter.
RJ11 plug to RJ45 socket adaptor.
4 Wire version most frequently used.
Commonly used to to connect patch cable to RJ11 broadband socket.
Tailed dongle type adaptor.
Adaptor with Cable 200mm long cable length 150mm ( approx.)