A method, and related equipment, for interoperating between a device (11a) in a first network, such as an IMS network, and a device (12a) in a second network (12), such as a WV network, the first network using a first protocol (SIP) requiring that a message have a request uniform resource identifier...http://www.google.com.tw/patents/US7181537?utm_source=gb-gplus-share專利 US7181537 - Method and apparatus for routing wireless village messages in an internet protocol multimedia subsystem
