A system, method and apparatus for supporting enhanced 911 (E911) emergency services, in a data communications network that includes Voice over Internet Protocol (VoIP) telephones. A network system includes a host network communicatively coupled to an E911 database management system, a network access...http://www.google.de/patents/US7027564?utm_source=gb-gplus-sharePatent US7027564 - System, method and apparatus for supporting E911 emergency services in a data communications network
