BT Openreach New NTE5C Master Socket - Telephone Engineers. Mar 31, 2017Hi I have a 5C master socket. Black wire connected to A and Green wire connected to B. The phone works fine when plugged in to the test socket. I added an extension to the master socket, Blue with white rings to 2, orange with white rings to 3 and white with blue rings to 5. Guide to rewiring internal UK phone wiring The face-plate on the NTE5 connects user side wiring to the Master socket by the dummy plug, this goes into the test socket (this is the socket used to test if your user-side wiring is at fault). Before you begin you may want to get the “line stats” from your modem/router, so you can do a before and after. Master socket wiring - BT Community FWIW, as your consumer panel (shown in photo 3) has no extension wiring connected to it, (if it did it would be wired on 2 and 5 of the panel) then your filtered faceplate isn't going to achieve more than what a regular broadband filter would, (the block type that would plug into your master socket and your router and phone would plug into it TELEPHONE SOCKET WIRING - HOW TO DO IT Sockets can only be installed on the new plug and socket system. If your phones are connected to a connector as shown in the picture below then you must contact your exchange service provider to have a Master socket installed. You may wire off the Master Socket. Tools You will also need tools to wire a socket and these should be in good condition.
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