有興趣的可以去google用下面這個paper黃色標題搜尋,有很多點可以download pdf檔
An Analysis of the Skype Peer-to-Peer Internet Telephony Protocol
因為包含一些圖片無複製到bbs
只截取abstract以供參考
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.
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