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SS7 ANSI-41 to SIP based call signaling conversion gateway for wireless VoIP E911

  • US 9,344,578 B2
  • Filed: 05/27/2014
  • Issued: 05/17/2016
  • Est. Priority Date: 04/04/2006
  • Status: Expired due to Fees
First Claim
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1. A method of converting call protocol at a conversion gateway, comprising:

  • receiving, at a mobile switching center, a Voice Over Internet Protocol (VoIP) call;

    converting, at a conversion gateway, said VoIp call into an SS7 ANSI-41 J-STD-036 transaction capability application part (TCAP)-based call;

    transmitting Session Initiation Protocol (SIP) call signaling associated with said VoIP call to a Voice Over Internet Protocol (VoIP) positioning center to retrieve routing information associated with said call;

    receiving an emergency services query key (ESQK) and an emergency services routing number (ESRN) relating to said VoIP call from said VoIP positioning center;

    translating said ESQK into an emergency services routing key (ESRK);

    translating said ESRN into a trunk select code; and

    routing said converted SS7 ANSI-41 J-STD-036 transaction capability application part (TCAP)-based call, based on said translated ESRK and said translated trunk select code.

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