This book presents the result of a study on voice over IP (VoIP) handoff schemes between wireless local area networks (WLANs) and cellular networks. Interest in this study arises from the proliferation of WLANs in the corporate environment and the emergence of new set of cell phones that can operate in both the cellular network and the WLAN. The focus on this study is on how to allow a voice call established when a user is in a WLAN to be handed off to the cellular network when the user moves outside the limits of the WLAN without dropping the call. Similarly, a call established when a user is in cellular network and enters a corporate environment with no cellular coverage will be handed off to the WLAN to avoid disruption of the call. The Hybrid Coupling Scheme is presented in the book in addition to known methodologies.

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