This adaptor allows you to connect a BT plug to an RJ11 socket.
1M RJ11 PLUG TO BT TELEPHONE SOCKET ADAPTOR DIRECT CONVERTER VIRGIN SKY VODAFONE
Rhino Cables RJ11 Plug To BT Socket
RJ11 plug to BT socket adapter
2m RJ11 PLUG TO BT TELEPHONE SOCKET ADAPTOR SOLID PURE COPPER VIRGIN SKY VODA
