RE: Silent Phones

[Nigel Orr <nigel@xxxxxxx>]

At 11:56 12/10/00 +0100, you wrote:
>If you put a large enough capacitor across the line to shunt the ring
it
>would have a VERY low impedance at the frequencies where the 9600 baud

What I had in mind was an L-C-R series resonant circuit across the line,
basically a 16 Hz filter.  However, I hadn't thought about some phones just
electronically detecting the ring signal and then starting up their own
ringers, it probably wouldn't be possible to shunt the ring enough to make
it undetectable without upsetting the line in other ways (unless they use a
diac or something so it doesn't trigger till it gets to 32V or so)

> current from the exchange whilst ringing that it would ring trip the
call
>just as if you had lifted and dropped the receiver.

I'd rather that feature was CLID dependent :-)

Nigel


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