Measurement Study of Commercial Video Conferencing Systems

In this technical report, we present our recent measurement study of commercial video conferencing systems. In our experiments, we focus on investigating three questions: Q1: What is the service architecture of each system? Q2: How is video quality adapted to different network conditions in those systems? Q3: What is the audio and video delays perceived by users? To answer these questions, in the following sections, we will present our experiment settings, the obtained results and insights derived from them. The rest of paper is organized as follows. Section II describes out testbeds for the experiment. Then we will answer Q1,Q2,Q3 in Section III.