Reversing phone line polarity, was Re: windows caller id and answermachine solution

[Stuart Grimshaw <stuart@xxxxxxx>]

On Thursday 17 May 2001 23:06 pm, you wrote:
> Yes it was me who posted on the hayes issue,
>
> see...
>
> http://www.ainslie.org.uk/callerid/hayes.htm
>

The doc above suggests reversing the line polarity to try and get better
CLID
with a hayes Acurra modem, could someone with better knowledge of the BT
stuff perhaps give a quick explanation of why this might/might not work,
and
what the implications would be if I swapped the polarity a) just to the
modem, or b) to the whole house.



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