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

SIP (Session Initiation Protocol) is an application-layer control protocol that can establish, modify, and terminate multimedia sessions such as Internet telephony calls (VOIP). Publisher, Artech House Publishers; 1st edition. And that's what you'll find below: an explanation of what SIP trunking At its most basic level, a SIP (Session Initiation Protocol) trunk acts as a connection between your company and your Internet telephony provider or ITSP (Internet Telephony Service Provider). Session Initiation Protocol (SIP), is an open standard that has been developed to address these and other demands placed on signaling protocols by not only voice, but all forms of multimedia transmission over data networks. In the world of technology, there seem to be too many acronyms to keep track of. Session Initiation Protocol (SIP): Most popular VoIP signaling protocol, lightweight and multipurpose, can also be used for video, instant messaging, etc. In many cases, it is also being displaced by SIP. Our brand-new SIP Client SDK provides a powerful and highly versatile solution to add quickly SIP (Session Initiation Protocol) based dial and receive phone calls features in your software applications and websites. Standards Track [Page 40] RFC 3261 SIP: Session Initiation Protocol June 2002 traversed understand that extension, it MUST insert a Proxy-Require header field into the request listing the option tag for that extension. But you need to understand it, especially if your organization or company is at all involved with the Internet (which nearly every is these days). The Cisco Unified Communications Manager supports the popular Session Initiation Protocol, or SIP. But the most important for your business right now is SIP. The Session Initiation Protocol, or SIP, has always seemed like one of those terms that people sort of understand – but not really. What is SIP, and how does it work? Book title, SIP - Understanding the Session Initiation Protocol.