In article , Lurch
wrote:

Not true, you need 3 wires per line, so if you are running two lines
on the extension cabling you need 3 pair cable, (6 wires).

If you don't mind crosstalk from the ring signal? I did that in the office
as a quick temporary job. The cable is about 5m long and the crosstalk when
the other line rings is quite loud.

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