[potato3732842]

>I can imagine there are many reasons the US doesn't fix this..one of which probably that much of US customer service is outsourced to people outside the US!

This. Gotta have your round robin of foreign call centers be able to spoof the main customer service line numbers for whoever they're contracted to represent.

Personally I think that should all be done in software these days, not something supported at the teleco level but what do I know.

[OkayPhysicist]

This isn't even an unreasonable feature to implement. We just need something like SSL certs: Has Legitimate Business holding phone number XYZ granted other entity the right to use their identity?

[LorenPechtel]

Exactly. There are plenty of legitimate reasons to spoof numbers, but all of them are people acting on behalf of the owner of the number being spoofed. Enforce that.