[viraptor]

It's not possible to solve on a technical level, (lots of edge cases) but this is my recurring "make the provider hurt" comment.

Every call should be possible to report and the last organisation which can't justify the caller ID sent gets fined for each such call. Ideally this will end up with a scammer. If not possible, it will end up with a telco which will assign blame on their international partner until they get cut off. No properly run telco wants to get cut off from sending calls to a large country.

But the fines have to start due to correct regulation which applies to everyone.