The Natural Philosopher typed
It will either work or it won't, by and large.
True, but it may work partially, like being fine for broadband and
outgoing calls, but not ringing properly for incoming calls (BTDT) and
possibly not then actuating an answering machine.
Connect up a phone to your suspect cable. Try to make an outgoing call,
try it for BB if you can and check it all rings if you phone it from
another line (mobile recommended).
I think the BT website has some other line-testing things but I'm not
sure if non BT customers can use them.
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Helen D. Vecht:
Edgware.