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[A1d3n]

My sister has recently moved into a new build that only has fttp so no copper line into the property at all. She has her phone plugged into line 1 on the ont which is under the stairs. The house has extensions wired in dining room/sitting room which she would rather have her phone plugged into. Next to the ont under the stairs there is a back box with coils in (which I assume are the extensions). Can anyone advise how to connect the extensions to line 1 on the ont? Do I need a certain faceplate and interconnecting voice lead?

[burakkucat]

From your description, it appears that building developer has only done part of the job -- or has not bothered to read and/or understand the Openreach document titled "How to Build a Fibre Network. Developer Guide." My copy is Version 4 - March 2017.

Without having sight of what you can see, I suspect that your assumption is correct. The way I would proceed is as follows --

• Go to each extension socket, in term, and make a note of how they are connected.
• At the back-box, under the stairs by the ONT, connect a tone-tracing oscillator and check for the signal at each extension socket.
• Consider the results of the above two steps.
• Connect a standard extension socket to the cable and mount it onto the under-stairs back-box.
• Obtain a type BS6312 431A to BS6312 431A patch cable. (That is just a cable with standard telephone plugs at each end.)
• Plug one end of the above patch cable into the telephone port of the ONT and the other end into the newly fitted extension socket.
• Confirm that telephone calls can be made and received.

As you will appreciate, there is a lot of "fine detail" that I have omitted in the above. Treat it as a preliminary guide.