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Re:Ask HN: Why can’t I block all incoming calls that aren’t ... by smt88 on Wednesday January 30, 2019 @02:38AM (#19033365)
This exists (kind of).

https://jollyrogertelephone.com

Re:Ask HN: Why can’t I block all incoming calls that aren’t ... by joshka on Wednesday January 30, 2019 @12:07PM (#19036921)
I used that for a little bit. It was fun, but a bit clunky to get going (dial another number, join the calls).