Patent ID: 8155109
Filing Date: 2012-04-10
Classification: H04L,H04M,H04W

Abstract:
1. A method of converting 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 voice over Internet protocol (VoIP) call from a VoIP phone via a local area network; routing said VoIP call using signaling system number 7 (SS7) ISUP based call signaling; converting said SS7 ISUP based call signaling into session initiation protocol (SIP) call signaling; passing said SIP call signaling to a voice over Internet (VoIP) positioning center; receiving routing instruction from a VoIP positioning center (VPC), including an emergency services query key (ESQK) and a trunk select code; and translating said ESQK into an emergency services routing key (ESRK).