Comment why not charge the originator (Score 2) 60
I am sure I am missing something, but why not charge the call originator an small "per attempt" fee, say $0.01 per attempt. Starting from the targeted phone number carrier, they would bill the next carrier up line, on and on until the the originating carrier bills the robocaller account. So robocaller man attempts 1 million calls per day, then he gets a bill for $10K. If it is not paid then the carriers eat the cost - that won't last for long. Assuming robocaller is using a VPN or other means to mask his identity, the VPN host gets nicked for the 10K unless they can pass it up the food chain.