@WalterShaub@journa.host *They* aren't inflicting these consequences, though. Third parties are.

Ultimately, it's a flaw in the protocol itself. The "calling from" number is self-supplied, not automatically detected like it should be.

Any attempt by the phone companies to correct this would result in a wide array of false positives, preventing (for example) grandma from getting her robocall that her prescriptions are ready.

Unfortunately, this is just one of those problems that would require a major underlying infrastructure change that nobody wants to pay for.