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This paper contains an experimental evaluation of the impact that congestion control algorithms NewReno, HTCP and CUBIC have on the latency of VoIP traffic. It was found that when a TCP flow and VoIP flow share a bottleneck link the induced delay in the VoIP flow is related to the growth of the congestion window. CUBIC induced the highest average latency in the VoIP flow and HTCP the least. The short comings of NewReno under particular traffic conditions has lead to the development of new TCP Congestion Control (CC) algorithms. The NewTCP project aims to provide independent real-world evaluation of these competing CC algorithms.
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