RoboTrak

I am an individual who can see a very simple solution to this problem. It uses existing technology that your IT people at the FTC are well aware of. It can be financed by charging robocallers a fee for maintaining the site.

FTC opens a site for blocked robocalls. Citizen calls an 800 number, enters the number they want blocked. Computer calls the number back and issues a PIN (Craigslist has this technology). Citizen calls back 800 number and enters the PIN. Computer asks "push 1 for yes, 2 for no". Number is then blocked. This prevents false blocking of numbers.
All robocall machines are required to log on to this site every day before starting robocall sequences, enter area codes they are calling and download all current blocked numbers. If there is a complaint, it will be simple to track which machines did it. If there is a complaint, machine will asked to display daily logs. Then you can determine if the machine robocalled without logging in first, a fine and or punishment will be determined. If it logged in and made the call anyway, you can determine if it was the sites fault, or a problem with the machine. 
A chronically faulty machine, or machines used by the same organization can then be fined or punished for faulty maintenance or cheating. 

Don Stanfield