Evan Doorbell's phone phreaking recordings include interesting sounds from the phone network of the 70s and 80s, and some good technical descriptions of how var

Evan Doorbell's phone phreaking recordings include interesting sounds from the phone network of the 70s and 80s, and some good technical descriptions of how various analog switching technologies and the telephone network worked "back in the day": https://www.evan-doorbell.com/ https://www.evan-doorbell.com/ I've spent hours listening to these and they're a great mix of nostalgia and technical detail. I barely remember what the analog phone network sounded like, being born around the time when digital switching was being rolled-out heavily. It's neat to learn what some of the sounds on the network actually were.