In article , Owain
wrote:

Kroma wrote:
A brass secondary socket in the main bedroom. Works ok with new BT Paragon
phone but not with old BT Freeway Cordless (which calls out etc but doesn't
want to ring).
A plug in extension in the study which behaves the same way as the socket it
is plugged into (in the main bedroom).

Sounds like the main bedroom socket is only wired with pins 2 and 5.
The new Paragon apparently doesn't need pin 3 wired to ring, but the
old Freeway does.

Find the wire connected to pin 3 at the other sockets and connect it.

Also check that pins 2 and 5 (the blue pair) aren't reversed. Even if
the colours are right don't assume it's right until you've checked pins
2, 3 and 5 on all the rest of the sockets and made sure the same colour
goes to the same pin on each.

--
Mike Clarke