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

  • US 8,774,171 B2
  • Filed: 07/18/2012
  • Issued: 07/08/2014
  • Est. Priority Date: 04/04/2006
  • Status: Active Grant
First Claim
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1. A method to convert a VoIP call, passed over a switched telephone network, into a VoIP call for presentation to a public safety access point (PSAP), comprising:

  • receiving a VoIP 911 originating call to be converted to signaling system number 7 (SS7) ANSI-41 J-STD-036 transaction capability application part (TCAP)-based call signaling;

    converting said VoIP 911 call using SS7 ANSI-41 J-STD-036 TCAP-based call signaling into session initiation protocol (SIP) call signaling; and

    transmitting said SS7 ANSI-41 J-STD-036 transaction capability application part (TCAP)-to-SIP converted call signaling associated with said VoIP 911 originating call to a physical VoIP positioning center to retrieve routing information associated with said VoIP 911 originating call;

    receiving routing instruction including an emergency services query key (ESQK) and a trunk select code; and

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

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