I also think it would be important for RingCentral to collect data on this kind of problem. Perhaps add a Report Invalid Call button, so they could see how widespread this issue is. If it hadn't been waking me up in the middle of the night repeatedly, I wouldn't have messed with it. So there could be thousands of these invalid calls per day, and they just write it off as "telemarkets - complain to the FCC". Pretty much the definition of ignoring the problem. Or, if there were a way of getting real-time assistance while the call was connected, and trace it to the source. I really think they could solve this if they a) accepted that there could actually be a problem with their system, and b) invested engineering time to solve it. Until they do a), they won't do b), and we just will continue to have this garbage. But it's had only a very minor impact since I worked around it.
Also can RC implement something similar to NoMoRobo, which can block spammers.