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Old 6th Dec 2017, 2:54 am   #6
Graham G3ZVT
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Join Date: May 2010
Location: Greater Manchester, UK.
Posts: 18,676
Default Re: GPO Telephone 746. New member.

I am pretty certain my local exchange (System Y) still gives a polarity reversal before ringing. Perhaps it's only lines where CLID enabled.
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