1) You can't eliminate Caller ID spoofing without overhauling the whole phone network, which won't happen until carriers are forced to do so by regulatory force

1) You can't eliminate Caller ID spoofing without overhauling the whole phone network, which won't happen until carriers are forced to do so by regulatory forces. A strong narrative here is the relative security guarantees of IPsec vs SS7. 2) Caller ID accuracy is a database federation problem and is not likely to be fixed without regulatory reform of data disbursement practices. Lockheed Martin Information Systems (Now called Neustar) is the central repository for all Caller ID records but many providers keep their own Caller ID databases to avoid paying the Neustar "dip" fees. The way robocalling works is with outbound voice detection. You light up X circuits and only route the call to your harassment agent when a human voice is detected. It's trivially simple to detect these guys, and the way many voip providers deal with this is to charge a lot for the first minute of a call.