In order that emergency service vehicles can be dispatched to the correct destination promptly, accurate information about the location of the caller is needed. Another problem concerns routing emergency calls to the correct destination. For emergency calls a universal code is used such as 911 in North...http://www.google.de/patents/US7177399?utm_source=gb-gplus-sharePatent US7177399 - Determining the geographical location from which an emergency call originates in a packet-based communications network
