An analysis of the skype peer-to-peer Internet telephony protocol (2004)
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@TECHREPORT{Baset04ananalysis,
author = {Salman A. Baset and Henning G. Schulzrinne},
title = {An analysis of the skype peer-to-peer Internet telephony protocol},
institution = {},
year = {2004}
}
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Abstract
Abstract—Skype is a peer-to-peer VoIP client developed in 2003 by the organization who created Kazaa. Skype claims that it can work almost seamlessly across NATs and firewalls and has better voice quality than other VoIP clients. It encrypts calls end-to-end, and stores user information in a decentralized fashion. Skype also supports instant messaging and conferencing. This paper analyzes key Skype functions such as login, NAT and firewall traversal, call establishment, media transfer, codecs, and conferencing under three different network setups. Analysis is performed by careful study of the Skype network traffic and by intercepting the shared library and system calls of Skype. We draw a map of super nodes to which Skype establishes a TCP connection at login. Skype login server Message exchange with the login server during login I.
Citations
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