An ISUP/SIP gateway is implemented to encapsulate SS7 location requests from a switched telephone network into an Internet protocol SIP message including one or more location objects. The ISUP/SIP gateway is implemented between a mobile switching center (MSC) and a VoIP positioning center (VPC) to provide...http://www.google.com/patents/US20070014282?utm_source=gb-gplus-sharePatent US20070014282 - Integrated services user part (ISUP) /session initiation protocol (SIP) gateway for unlicensed mobile access (UMA) emergency services call flow
