Seems to me that the FCC doesn't actually want to stop these. Watch the senate commission deposition(?) of Adrian Abramavich. He says all these calls are routed through 5 or 6 tier-2+ VOIP firms who openly solicit robocall business and then blend the traffic to prevent the most obvious red flags. Just pull their licenses(?). Unless there's more to the story and everyone in the industry is getting rich from this, which sounds like is the case. Remember this is the same FCC that couldn't detect millions of fake anti-net neutrality comments. C'mon. Are we really dumb enough to think that they're that dumb?

If everyone in the industry is getting rich from this and the FCC is serving industry and not the people, then the plan of action would quite probably look like this:

1. Pass laws that make robocalls illegal to pacify the populace.

2. Charge one or two operators a year in civil court max, but not enough to actually deter people from doing it. And make sure to brand them names like "the robocall king" so that people think you've actually made a huge dent in robo-calling. Again, to pacify the populace.

3. Don't actually enforce the laws you passed on any meaningful scale and don't require technological changes which would stop this. Despite the fact that it doesn't happen in any other country, even third world ones, pretend that this is just a technologically intractable problem.

Pathetic.