Patent ID: 9344578
Filing Date: 2016-05-17
CPC Classification: H04L,H04M,H04W

Claim Text:
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.