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Railway freight dispatching telephone system is a kind of railway dispatching telephone systems, providing freight coordinating communication service. It requires high transmission data rate, high interactivity and customizable service in a high mobility environment. VoIP in wireless networks is a promising technology. It is significant to design a railway freight dispatching telephone system based on VoIP in wireless networks (IEEE 802.11 and IEEE 802.16). This paper analyzes the requirements of VoIP- based railway freight dispatching telephone system, proposes VoIP architecture for railway freight dispatching telephone system, analyzes the QoS performance of VoIP-based railway freight dispatching telephone system, and deployed experiments on a 20km railway freight line testbed. Index Terms - Wireless Local Area Network (WLAN), Worldwide Interoperability For Microwave Access (WiMAX), Quality Of Service (QoS), Railway Freighting Dispatching Telephone System, VoIP.

Railway Freight Dispatching Telephone System Based on VoIP in Wireless Networks