Session recognition and Bandwidth Guarantee for Encrypted Internet Voice Traffic : Case Study of Skype

Under limited bandwidth, how to improve quality of service in VoIP (Voice over Internet Protocol) is a significant problem of the network traffic today. However, some protocol of VoIP traffic such as Skype is encrypted; with this problem, the network administrator can't manage the VoIP bandwidth and result in time delay or loss of voice packets. The purpose of this study is to improve VoIP bandwidth guarantee by identifying encrypted Skype session. First, we use the Pcap (packet capture library) to capture session characteristics from the information about established connections in the network. Next, K-means is used to do clustering analysis and pattern recognition. After then, we can recognize the Skype session. Finally, we can feed the information of encrypted Skype session which has been identified into the bandwidth management system. So that, we can improve quality of bandwidth guarantee in Skype.