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Despite recent advancements in cellular mobile network architectures, full coverage for seamless handoffs is still an open issue. Moreover, cost efficient calls for the end users in urban regions with very high coverage can be improved. In many areas overlapping networks like WLAN, GSM and 3G provide alternative wireless links. Ideally, the user should be connected to the most attractive network any time according to predefined priorities using an automatic handover. In this paper, the authors present a framework for vertical handoff with dual-mode (cellular/WLAN) devices by using the conference bridging functionality of a PBX gateway. The communication between client and server will be realized via an overlay signaling channel.
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