1
Michael C G Lee, Francis Durufle, Bill Allan: Method and apparatus for digital cellular internet voice communications. Nortel Networks, January 25, 2005: US06847632 (51 worldwide citation)

A digital cellular handset capable of supporting voice communications over the Internet, in addition to the digital cellular handset's usual mode of voice communications over the digital cellular network/public telephony network is disclosed. Internet protocol software such as H.323, Session Initiat ...


2
Michael Charles Gerald Lee, Francis Durufle: Handset based automatic call re-initiation for multi-mode handsets. Nortel Networks, February 20, 2001: US06192239 (11 worldwide citation)

In the occurrence of a multi-mode portable handset leaving the coverage area of a first operating network during an active telephone call on the first operating network, a method is disclosed for terminating the telephone call and re-initiating it within a second operating network. The signal streng ...