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Emergency location information gateway for public safety answering points (PSAPs) and method of use

  • US 8,442,481 B2
  • Filed: 07/28/2010
  • Issued: 05/14/2013
  • Est. Priority Date: 05/16/2006
  • Status: Active Grant
First Claim
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1. A method for receiving emergency calls with embedded emergency location information, comprising:

  • receiving a 911 message for an emergency event on a location application on a Public Safety Answering Point (PSAP) gateway network device with one or more processors from a target network device with one or more processors via a communications network,wherein the PSAP gateway network device is connected to other PSAP network devices and intercepts and monitors all emergency message communications received via the communications network for the other PSAP network devices, andwherein the PSAP gateway can receive 911 messages from legacy 911 networks and Emergency Services IP networks (ESInet);

    determining on the location application on the PSAP gateway network device whether the 911 message includes embedded Session Initiation Protocol (SIP) emergency location information for the target network device which sent the 911 message for the emergency event, and if so,extracting on the location application on the PSAP gateway network device the embedded SIP emergency location information in the SIP message,determining on the location application on the PSAP gateway network device a physical location of the target network device from the extracted embedded SIP emergency location information,saving the determined physical location for the target network device via the location application in a computer readable medium on the PSAP gateway network device for use by other PSAP network devices,and if not,extracting on the location application on the PSAP gateway network device a phone number from the SIP message,determining on the location application on the PSAP a physical location for the target network device using the extracted phone number by sending one or more queries to one or more Automatic Location Information (ALI) or Dynamic ALI (D-ALI) databases associated with the other PSAP network devices;

    saving the determined physical location for the target network device via the location application in a computer readable medium on the PSAP gateway network device for use by other PSAP network devices; and

    determining on the location application on a Public Safety Answering Point (PSAP) gateway network device whether the received 911 message is being sent to a legacy 911 network,and if so, creating a new legacy 911 message with the determined physical location information for the target network device in a format usable on the legacy 911 network, andforwarding the new legacy 911 message for transport and dissemination by the legacy 911 network,and if not,creating a new ESInet 911 message with the determined physical location information for the target network device in a in format usable on the ESInet,forwarding the new ESInet 911 message for transport and dissemination by the ESInet,the location application on the PSAP thereby providing transformation of 911 messages in both inbound and outbound directions including transformation of messages with or without location information included, into new 911 messages with determined physical location information and from a format usable on legacy 911 networks into to a format usable on ESInets and from a format usable on ESInets into a format usable on legacy 911 networks.

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