Read this together with this story <a href="http://news.ycombinator.com/item?id=462592" rel="nofollow">http://news.ycombinator.com/item?id=462592</a> about people using VoIP and caller ID spoofing to prank call 911 and dispatch SWAT teams.<p>Scary stuff. A sophisticated enough criminal could plan to pull a crime, while at the same time DOSing the 911 call center so any legitimate 911 calls would get lost in the noise.