I have a pile of a modems, and a ton of telemarketers / general idiots asking for tech support, and I'd like to stop them from calling by somehow blocking them with with a spare computer. I'm wondering if it's possible to slip a computer running any OS between a jack and a phone, have the computer recieve the call, check the caller ID from the first ring, and if it doesn't appear in a blacklist, ring the phone. Otherwise, disregard the call, and pretend it never happened.
Is such a thing possible, using spare parts?
Is such a thing possible, using spare parts?