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Realtime video streaming is one of the most important tool for the computer supported collaborative workspace (CSCW). CSCW requires bi-directional or many-directional video exchanging. The delay or jitter caused by network quality is easily affecting application or users of CSCW. The quality of experience (QoE) of CSCW with video streaming over IP networks depends on the quality of network. It is important to consider the relationship between the QoE of video streaming and quality of service (QoS) of the network in order to achieve high quality CSCW services effectively. Then we can define the suitable parameter of networks for the applications. The goal of this research is to establish the evaluation method of the correlations between the QoE of CSCWs and QoS of networks to obtain the optimal real-time communication system design. In this paper, we propose a method to measure the correlation between the application and network QoS with precise packet monitoring environment. The result shows that micro-second resolution helps a lot to capture the precise behavior which effects the codec system's performance.