Point-in-poly routing for voice over internet protocol (VoIP) emergency calls with embedded geographic location information

• US 20100046720A1
• Filed: 09/08/2008
• Published: 02/25/2010
• Est. Priority Date: 08/22/2008
• Status: Abandoned Application

• Current Assignee: TeleCommunication Systems Inc (Comtech Telecommunications Corporation)
• Original Assignee: TeleCommunication Systems Inc (Comtech Telecommunications Corporation)
• Inventors: Geldenbott, Gerhard
• Application Number:
  US12/230,901
• Publication Number:
  US 20100046720A1
• Time in Patent Office: Days
• US Class Current: 379/45
• CPC Class Codes: H04L 65/40 Support for services or applications
• CPC Class Codes: H04M 11/04 with alarm systems, e.g. fire, police or burglar alarm systems
• CPC Class Codes: H04M 2242/30 Determination of the location of a subscriber
• CPC Class Codes: H04M 7/006 Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP) , including next generation networks with a packet-switched transport layer H04L65/00 takes precedence; aspects not specific to the type of network H04M3/00; special services in those networks H04M3/42

Abstract

The correct PSAP that can service an emergency call originating from a VoIP terminal with the caller'"'"'s geographic information embedded in the call signaling is determined. A latitude and longitude is extracted from geographic information that is embedded in the call signaling. In some cases only the civic address is available. Then a database is accessed to associate spatial polygons that represent the geographic boundaries of the 6000+ PSAPs in the nation to given latitude and longitude information extracted from the emergency call. The combination of these two important features together result in an accurate and precise “just-in-time” PSAP selection for the caller.

Claims

1. A method of determining a correct public service access point (PSAP) for an emergency call, comprising:

extracting a latitude and longitude from geographic information that is embedded in call signaling; and

initiating access to a geodatabase associating a spatial polygon representing a respective PSAP service region with a given latitude and longitude;

wherein a precise just-in-time PSAP selection may be provided for a given caller.

2. The method of determining a correct public service access point (PSAP) for an emergency call according to claim 1, wherein said extracting comprises:

extracting said latitude and longitude from a civic address.

3. The method of determining a correct public service access point (PSAP) for an emergency call according to claim 1, wherein:

said emergency call originates from a voice over internet protocol (VoIP) terminal.

4. A method of determining a correct public service access point (PSAP) for an emergency call, comprising:

extracting a latitude and longitude from geographic information that is embedded in call signaling; and

initiating access to a master street address guide (MSAG) geodatabase associating a street address represented by a respective PSAP service region with a given latitude and longitude;

wherein a precise just-in-time PSAP selection may be provided for a given caller.

5. The method of determining a correct public service access point (PSAP) for an emergency call according to claim 4, wherein said extracting comprises:

extracting said latitude and longitude from a civic address.

6. The method of determining a correct public service access point (PSAP) for an emergency call according to claim 4, wherein:

said emergency call originates from a voice over internet protocol (VoIP) terminal.