Comment Re:How has this not been fixed? (Score 2) 89
The existing phone system was designed to connect phone calls.
There is simply no infrastructure to verify the origin of a call.
There are several efforts underway to create such an infrastructure.
They all revolve around cryptographically secure signatures.
It's a hard problem, there's a lot of programming, and it has to be deployed to carriers all around the world.
There can't be any exceptions. If your go-live date is 2022-Jan-01, and Taiwan Telco isn't ready, then no one in Taiwan can call anyone in the U.S. If you make an exception, then all the spammers simply route their calls through Taiwan and you're back where you started.
On top of all that, spammers pay telcos to carry their calls. So the whole thing is a big expense and headache for the telcos, and the end result is a revenue *loss* for the telcos. So they don't want to do it in the first place.