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How does e911 work?

    In North America where 9-1-1 was chosen as the easy access code, the system tries to automatically associate a location with the origination of the call. This location may be a physical address or other geographic reference information such as X/Y map coordinates. The calling party's telephone number is used in various ways to derive a location that can be used to dispatch police, fire, emergency medical and other response resources. Automatic location of the emergency without the person calling for help having to provide it reduces the time involved in linking people in trouble to the resources that can help. Automatic location is often useful in times of fires, break-ins, kidnappings, and other events where communicating one's location is difficult or impossible. source

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