I have always had some kind of external modem.
When I started getting late night threatening phone calls aimed at my (future) wife back in the eighties, I would simply hook up the modem to the phone line, turn off the phone ringer, and let the modem answer and screech in their ear. Within a few days, no more late night calls.
When the era of fax spam hit, I did the same thing. If I wasn't home, the modem was hooked up. When I went to bed, the modem became my "answering machine."
It was great. I never had to put up with phone/fax spam for more than a week or two.
More recently, we got a phone land line through Verizon, who promptly sold our information to everyone and his dog. We started getting calls from India via a number area-coded in Arizona. We got calls for free trips and insurance and Wal*Mart gift cards.
No problem. We had taken two phone lines, because we need one for the fax. I simply swapped the fax over to line #1 and called it line #2. The phone spam dried up in a couple of weeks (seems Verizon didn't bother selling our line #2 info).
We still get the occasional fax spam. Maybe one a week.
I figure we're ahead of the game.
But the OP? That dude has my admiration.
Very cool.