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Systems and methods for emergency call route failover

  • US 10,716,018 B2
  • Filed: 01/22/2020
  • Issued: 07/14/2020
  • Est. Priority Date: 03/01/2013
  • Status: Active Grant
First Claim
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1. At least one machine-readable medium, excluding transitory signals, having stored thereon instructions, which when executed by at least one machine, implements redundancy in routing emergency calls via gateway nodes in an Internet Protocol Multimedia Subsystem (IMS) network by causing the at least one machine to:

  • receive a Session Initiation Protocol (SIP) INVITE request associated with an emergency call;

    create a dynamic peer list including gateway nodes that successfully respond to a SIP OPTIONS request;

    select a gateway node from the dynamic peer list;

    initiate a SIP INVITE request associated with the emergency call towards the selected gateway node to deliver the emergency call to a public safety answering point (PSAP);

    detect a failover condition when the selected gateway node fails to respond to the SIP INVITE request within a time period; and

    in response to the failover condition, continue to select a new gateway node from the dynamic peer list and initiate a SIP INVITE request associated with the emergency call towards the new gateway node until a successful response to the SIP INVITE request is received by the E-CSCF.

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