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Determining the geographical location from which an emergency call originates in a packet-based communications network

  • US 7,177,399 B2
  • Filed: 06/04/2004
  • Issued: 02/13/2007
  • Est. Priority Date: 02/27/2004
  • Status: Active Grant
First Claim
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1. A method of providing a routing key for routing an emergency call from a packet-based communications network node to an emergency services network node in a switched telephone network, the packet-based communications network comprising an access part and a core part, said method comprising the steps, performed at a node of the core part of the packet-based communications network, of:

  • (i) requesting, during the emergency call, a node in the access part of the packet-based communications network to determine a current geographical location of a terminal from which the emergency call originates;

    (ii) receiving information about the determined current geographical location from the node in the access part of the packet-based communications network;

    (iii) generating a routing key on the basis of the received information and pre-specified information about geographical locations served by particular emergency service network nodes; and

    (iv) storing said generated routing key together with the received information at the node in the core part of the packet-based communications network.

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