In message t, Chip
writes
Yes I do - I may be daft but not THAT daft. I was shocked too!! The only
explanation I could think of was that it goes through the alarm somehow
(it's only the upstairs extension which goes off - all the sockets
downstairs continue to work as normal).

Daz


BZZT... probable right answer

Hadn't thought about that, but yes, the alarm is likely grabbing the
line to inform the monitoring centre the power's out...

Could be, but he says that the sockets down stairs continue to work
normally. If it had seized the line then you would not expect this.
Maybe try having a phone plugged in upstairs while disconnecting the
power to that ring and listen to what happens, does something try to
dial out?

Does the alarm panel contain a dialler?
If it does is it plugged into a proper phone socket or has some one hard
wired it into the phone circuit some where?




Sometimes life throws odd things.


--
Bill