I work for a department that takes most of the cellular 911 calls for my state. Yesterday there was a lot of interest in what exactly happens when you dial 911 on your cell phone, where the call goes, what is the most direct way to receive help in an emergency, etc.
I am happy to answer any questions that I can. Ask away!
Edit: Ok guys, I need to wrap this up for the time-being, but I will come back and try to answer as many questions as I can! You guys have been amazing and I can't believe how much this AmA blew up! Thank you for a great day!