Интересная статья о Skype
Вот не очень новая, но всё равно интересная статья о внутренней механике Skype:
An Analysis of the Skype Peer-to-Peer Internel Telephony Protocol
Salman A. Baset, Henning Schulzrinne
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.
