As VoIP in the Internet all kinds of application more and more big, the proportion of its service quality assurance is increasingly attention by the industry, in fact, VoIP service quality has direct relationship with the performance of the network, especially the performance of four parameters: the end-to-end delay, delay jitter, packet transmission frame erasure and disorderly, and improve the service quality is often based on the four parameters adjustment and control, this article will to a concrete analysis of the four parameters,
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