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You should be able to forbid incoming calls from certain countries on your line. Or international calls at all.

This would be very useful for grandparents. Why isn't this a thing yet?

because VOIP will get around that.

Yes, but it will increase the cost to the scammers and filter out the ones that can't figure it out.

Possibly have a reroute rather than a block so it's harder to detect. Reroute the calls to a voice mailbox that essentially saves to /dev/null.

Can you reroute to a pay service? So every time they call you they get dinged?