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If the authors or a colleague make a 9-1-1 call, they want assurance that first responders can reach them as quickly as possible. In the United States this is assured by the E9-1-1 system, and the reliability of E9-1-1 is an important paper of faith for most people, at home and at work. Very few of the authors' have a good understanding of how E9-1-1 works. As they shall discuss in this paper, the legal requirements for E9-1-1 are fragmented, with only 16 states legally mandating E9-1-1 compliance for businesses as of early 2010. Nevertheless, TDM PBXs have incorporated sophisticated and dependable emergency call handling features, so whether mandated or not they have come to rely on E9-1-1 and it has performed well.
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