A robot that blocks robotcalls

Nomorobo is a cloud service intended to block robotcalls.

It uses an audio Captcha: “You might be a robocaller,” the system asks the illegal robocaller. “To prove you are a human please enter the number 71. … I’m sorry that is incorrect. Your number has been blacklisted.”

Source
http://arstechnica.com/information-technology/2013/04/no-more-robocalls-new-tech-automatically-hangs-up-on-robots/

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