SIP / Session Initiation Protocol
The Session Initiation Protocol (SIP) is a signaling and call setup protocol for VOIP (Voice Over IP) communications. It can be used to create two-party, multiparty, or multicast sessions that include Internet telephone calls, multimedia distribution, and multimedia conferences. It can also be used in any application where session initiation is a requirement like presence and events notifications, instant messaging and Internet real-time fax delivery signaling. SIP is designed to be independent of the underlying transport layer and for this reason SIP clients can use TCP or UDP (typically on port 5060) to connect to SIP servers and other SIP endpoints.
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