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<p><b>Abstract</b>—In this paper, we address issues in implementing Voice over IP (VoIP) services in packet switching networks. VoIP has been identified as a critical real-time application in the network QoS research community and has been implemented in commercial products. To provide competent quality of service for VoIP systems comparable to traditional PSTN systems, a call admission control (CAC) mechanism has to be introduced to prevent packet loss and over-queuing. Several well-designed CAC mechanisms, such as the Site-Utilization-based CAC and the Link-Utilization-based CAC mechanisms have been in place. However, the existing commercial VoIP systems have not been able to adequately apply and support these CAC mechanisms and, hence, have been unable to provide QoS guarantees to voice over IP networks. We have designed and implemented a QoS-provisioning system that can be seamlessly integrated with the existing VoIP systems to overcome their weakness in offering QoS guarantees. A practical implementation of our QoS-provisioning system has been realized.</p>
Voice over IP, real-time, delay, admission control.

S. Wang, Z. Mai, D. Xuan and W. Zhao, "Design and Implementation of QoS-Provisioning System for Voice over IP," in IEEE Transactions on Parallel & Distributed Systems, vol. 17, no. , pp. 276-288, 2006.
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