Patent ID: 8774171

Claim:
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).