Factors that Affect Conversational Voice Communication Quality (CVCQ) of VoIP Systems

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Executive Summary

This paper presents a general method for comparing the conversational quality of voice communication systems over networks with delays. The perceptual evaluation of an interactive conversation depends on the quality and the latency of the one-way speech segments received. Due to path-dependent and non-stationary conditions in the Internet, the delays incurred when a conversation switches from one client to another are asymmetric and lead to a degraded perceptual quality as compared to a face-to-face setting. The conversational dynamics can further be disrupted by variations in the one-way quality and latency. As the factors that affect conversational quality may be counteracting to each other, trade-offs must be made among them.

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