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SIP: Understanding the Session Initiation Protocol Alan B. Johnston
Publisher: artech-house

SIP (Session Initiation Protocol). SIP, is arguably the most important protocol for Lync. What is SIP, and how does it work? SIP is a standard protocol used by numerous communication platforms, and its purpose is, as the name says, to initiate sessions, although it's been extended to serve other purposes as well, such as presence. Session Initiation Protocol, a.k.a. Publisher, Artech House Publishers; 1st edition. The Cisco Unified Communications Manager supports the popular Session Initiation Protocol, or SIP. SIP is defined in RFC 3261 from the IETF, and that document is a good source for a basic understanding of the protocol. The Session Initiation Protocol (SIP) is another duplex communication protocol that is worth advising in Comet architectural design. Book title, SIP - Understanding the Session Initiation Protocol.