You only need 2 wires for the main incoming line, but 3 wires are needed from the main BT master socket to any extension slaves. Terminals 2, 3 & 5. 2 & 5 being line & three is to do with the ringers.
How many wires for phone VOIP
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Not these days. Very few, if any, modern phones require the "bell" wire to "ring".
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