What’s The Best Call Blocking Hardware For Analog (home) Phones?

Years ago, Sharper Image had advertised a Call Blocker box for sale. It was simple, once connected and a call came in, the caller was asked to enter a passcode. If they did not or if they got it wrong, it hung up. The phone would never ring unless the person entered that code. I have seen other crappy call blockers that ask politely not to call again or wait until your phone rings and give you the option to block or accept. To me, these products are 100% useless. I have been scouring the internet looking for new products or even a working model of the Sharper Image product. Can someone help? Does anyone know of a similar product for sale?

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