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Systems and methods for emergency call route failover

  • US 10,219,171 B2
  • Filed: 04/05/2018
  • Issued: 02/26/2019
  • Est. Priority Date: 03/01/2013
  • Status: Active Grant
First Claim
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1. A system for performing an emergency call route failover within a telecommunications network, comprising:

  • at least one processor;

    an Emergency Call Session Control Function (E-CSCF) executed by the processor and configured for;

    receiving a Session initiation Protocol (SIP) INVITE request associated with an emergency call;

    obtaining an Emergency Service Routing Key (ESRK) number or Public Switched Telephone Network (PSTN) number associated with the emergency call;

    when the ESRK number is in a range accessed by the E-CSCF and when a translated number is associated with the ESRK number;

    selecting an Interconnection Border Control Function (IBCF) server or a Session Border Controller (SBC) server from a peer nodes list;

    modifying the SIP INVITE request to include the translated number;

    forwarding the SIP INVITE request to the selected IBCF server or the selected SBC server based on the translated number for routing to a Public-Safety Answering Point (PSAP) associated with the translated number;

    when the ESRK number is in a range accessed by the E-CSCF and when a translated number is not associated with the ESRK number;

    selecting a Border Gateway Control Function (BGCF) server or a Media Gateway Control Function (MGCF) server from a peer nodes list;

    modifying the SIP INVITE request to include the ESRK number; and

    forwarding the SIP INVITE request to the selected BGCF server or the selected MGCF server based on the translated number for routing to a Public-Safety Answering Point (PSAP) associated with the ESRK number.

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