An Analysis of the Skype Peer-to-Peer Internet Telephony Protocol. Baset, S. A. & Schulzrinne, H. G. 04/2006 2004.
An Analysis of the Skype Peer-to-Peer Internet Telephony Protocol [link]Paper  abstract   bibtex   
Skype is a peer-to-peer VoIP client developed by KaZaa in 2003. Skype claims that it can work almost seamlessly across NATs and firewalls and has better voice quality than the MSN and Yahoo IM applications. It encrypts calls end-to-end, and stores user information in a decentralized fashion. Skype also supports instant messaging and conferencing. This report 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 Skype network traffic.
@conference {Baset04ananalysis,
	title = {An Analysis of the Skype Peer-to-Peer Internet Telephony Protocol},
	booktitle = {INFOCOM 2006. Proceedings of the 25th Annual Joint Conference of the IEEE Computer and Communications Societies},
	year = {2004},
	month = {04/2006},
	address = {Barcelona, Catalunya, Spain},
	abstract = {Skype is a peer-to-peer VoIP client developed by KaZaa in 2003. Skype claims that it can work almost seamlessly across NATs and firewalls and has better voice quality than the MSN and Yahoo IM applications. It encrypts calls end-to-end, and stores user information in a decentralized fashion. Skype also supports instant messaging and conferencing. This report 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 Skype network traffic.},
	keywords = {P2P, VoIP},
	url = {http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.84.2433},
	author = {Salman A. Baset and Henning G. Schulzrinne}
}

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