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The speech quality of Voice over IP (VoIP) applications can be assessed subjectively as Quality of Experience (QoE) and objectively as Quality of Service (QoS). QoE is multifaceted, which ties together user perception and expectations to application, network performance, and various voice data processing (e.g., codec) and streaming (play-out buffering) methods. Most of prior work focuses on understanding the impact of network performance on QoE, but not explicitly describing how playout buffer affects user satisfaction or QoE assessment. Towards this goal, this paper presents a statistical analysis of the correlation among QoE assessment, QoS measurement, and the impact of playout buffer on QoE assessment.
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