Performance Analysis of Voice Call using Skype |
The purpose of this paper is to investigate the performance of voice calls using the current version of Skype. Hence the testbed, consisting of three PCs and one router, was designed for the QoS experiments and QoE experiments about the point-to-point Skype voice calls. In the experiments, the ITU-T P.50 sample voices called “British English” were used to replace the real time conversation. The QoS experiments aimed to find out the congestion control algorithm of how Skype adjust payload size, interarrival time and throughput under different packet loss rates. The QoE experiments investigated the changes of performances of Skype voice calls under different packet loss rates through MOS measured by PESQ and subjective tests. The results showed that Skype may apply the category congestion control algorithm to recover the quality of Skype voice calls under different packet loss rates. The performances of Skype voice calls would degrade and become discontinuous with the packet loss rate increasing.
Liu L, Sun L