Nationwide table routing of voice over internet protocol (VOIP) emergency calls
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United States of America Patent
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Nov 29, 2011
Grant Date -
Feb 25, 2010
app pub date -
Aug 21, 2009
filing date -
Aug 22, 2008
priority date (Note) -
In Force
status (Latency Note)
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Abstract
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 obtained from a street address returned from an MSAG relating to a VoIP call, and PSAPs to an input ESN. An emergency caller's civic street address is matched against a nationwide MSAG data store to result in a MSAG ESN. From the street address, the emergency caller's ZIP code is matched to a PSAP in an appropriate ZIP/PSAP data store. A matching PSAP from both the ZIP/PSAP and PSAP/ESN data stores determines with great reliability the identity of the proper PSAP for that emergency caller.
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