The present invention is used in an emergency network to identify and provide the correct public safety access point (PSAP) to service an emergency call originating from a Voice Over Internet Protocol (VoIP) subscriber. Data stores in an emergency services network associate PSAPs to an input ZIP code...http://www.google.de/patents/US8068587?utm_source=gb-gplus-sharePatent US8068587 - Nationwide table routing of voice over internet protocol (VOIP) emergency calls
