Nationwide table routing of voice over internet protocol (VOIP) emergency calls
View Patent ↗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.
1. A method of providing routing of an emergency call to a reliably proper public safety access point (PSAP), comprising:
receiving a request for location relating to an emergency call from an emergency wireless device
obtaining a street address associated with said emergency wireless device;
determining at least one PSAP associated with a ZIP code of said street address;
determining at least one PSAP associated with an emergency services number (ESN) assigned to said emergency call; and
providing for use by a routing device an identity of a matching unique PSAP associated with both a ZIP code of said street address and said ESN.
2. The method of providing routing of an emergency call to a reliably proper public safety access point (PSAP) according to claim 1 , wherein:
said address is determined using a query to a Master Street Address Guide (MSAG) device.
3. The method of providing routing of an emergency call to a reliably proper public safety access point (PSAP) according to claim 1 , wherein:
said emergency call is initiated at a wireless voice over Internet Protocol (VoIP) device.
4. The method of providing routing of an emergency call to a reliably proper public safety access point (PSAP) according to claim 1 , wherein:
said emergency call is initiated at a landline voice over Internet Protocol (VoIP) device.
5. The method of providing routing of an emergency call to a reliably proper public safety access point (PSAP) according to claim 1 , wherein:
said emergency call is a voice over Internet Protocol (VoIP) call.
6. A table routing data store in communication with an emergency 911 network, comprising:
a first table associating input ZIP codes with serving public safety access points (PSAPs); and
a second table associating input emergency services numbers (ESNs) with PSAPs; and
a physical interface in communication with a routing device;
wherein an emergency call is routed by said routing device to a PSAP matched in both said first table and said second table to a given emergency call.
7. A table routing data store in communication with an emergency 911 network according to claim 6 , wherein:
said emergency call is a voice over Internet Protocol (VoIP) call.