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Session Initiation Protocol (SIP)

Session Initiation Protocol (SIP) is a communication protocol specified by the Internet Engineering Task Force (IETF). It’s the first real-time communication protocol to enable multiuser sessions, regardless of media content. SIP enables a new generation of communication services across the Internet, as well as over fixed and mobile IP networks. SIP enables communications to be initiated and managed, and its key channels include voice, video and instant messaging (IM).

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