Known as Secondary type and has no components embedded.
RJ45 Secondary Telephone Line Adaptor RJ45 Plug to BT type socket Kauden BK4503
RJ45 PLUG to BT SOCKET MASTER PSTN NETWORK ADAPTER LAN Ethernet Telephone Line
RJ45 PLUG TO BT SOCKET SECONDARY SLAVE LINE ADAPTER UNIT TELEPHONE CONVERTER
RJ45 PLUG TO BT SOCKET MASTER LINE ADAPTER UNIT TELEPHONE CONVERTER
RJ45 PLUG TO BT SOCKET PABX MASTER LINE ADAPTER UNIT TELEPHONE CONVERTER
5x RJ45 PLUG TO BT SOCKET MASTER LINE ADAPTER UNIT TELEPHONE CONVERTER
