What is SIP

From Bandipedia

Session Initiation Protocol (SIP) is a text-based protocol, like HTTP or SMTP, used in multimedia (voice, video, instant messaging) applications to initiate, modify or terminate an interactive user session. SIP builds on prior Internet protocols: SMTP, which defines the format for e-mail messages; and HTTP, which defines the format for Web-based communication. Additionally, SIP uses functions from RTP/RTCP and touches on other Internet protocols like H.323, TCP, UDP, and IP. It is widely used as signaling protocol for these technologies. (www.voipplanet.com/backgrounders/article.php/3505511)

Similar to HTTP, SIP is text-based and allows all types of equipment to communicate with each other—regardless of make, model or geographic location. By utilizing two elements, clients and servers, SIP allows individuals to communicate in real time.


SIP was originally designed by Henning Schulzrinne at Columbia University.


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