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To build SPF for the PSTN you'd first have to build DNS for the PSTN, then convince the manufacturers of carrier-grade switches to implement it, then convince t
by superuser2 10y ago
To build SPF for the PSTN you'd first have to build DNS for the PSTN, then convince the manufacturers of carrier-grade switches to implement it, then convince telcos to buy new switches, then convince every single telco on Earth to throw out its last remaining equipment that doesn't enforce "SPF" for caller ID (or spammers would just use those companies).
- toast0 10y agoDNS for the PSTN exists, e164.arpa; mostly not public though. It would be a slog to get it implemented, but if spammers are limited to spoofing international numbers or from rural carriers, that's still a win because I can ignore calls from out of the area.
- spc476 10y agoMore specifically (in case anyone wants to know more---I know it surprised me to learn that caller name information is sent via DNS) NAPTR records.