How to block all inbound calls

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I'm looking for a device that will connect inline on a landline phone. I remember Radio Shack use to sell such a device that when you called the line it asked for a code. If you didn't enter it the phone wouldn't even ring.

I've looked at a number of call blocking devices but cant find one with the feature to block all inbound calls and allow only those with the code.


Can someone point me somewhere?



Edited by Radical63

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