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Session Initiation Protocol is an Application Layer control (signaling) protocol for creating, modifying, and terminating sessions with one or more participants. These sessions include Internet telephone calls, multimedia distribution, multimedia conferences, and presence. The SIP Protocol is defined as part of IETF RFCs starting with RFC 3261, and more, all located at www.ieft.org. SIP invitations are used to create sessions that carry session descriptions, which allow participants to agree on a set of compatible media types. SIP makes use of elements called proxy servers to help route requests to the user's current location, authenticate and authorize users for services, implement provider call-routing policies, and provide features for users.
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