|Re: Is There a Device to Block Selected Incoming Numbers|
|Rick M (firstname.lastname@example.org)|
Mon, 02 May 2005 01:32:15 -0500
Telco selective call blocking is best answer. Only the Telco knows the|
I.D. of the incoming call before it generates ring voltage on your
phone line. In order for an aftermarket device to do what you want,
you would have to hear at least one ring, because the caller I.D.
information is sent in digital format between the 1st and 2nd ring.
So, an aftermarket device would have to process all 1st rings thru the
unit, or, all first rings would go thru to all house phones. Either
option is not very marketable.
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