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TheSession Initiation Protocol (SIP), is an application-layer control (signaling) protocol for creating, modifying, and terminating sessions with one or more participants. SIP is developed by SIP working group specified by the Internet Engineering Task Force (IETF), peer-to-peer communication protocol to establish, manipulate, and tear down communication sessions at application layer. These sessions include Internet telephone calls, multimedia distribution, and multimedia conferences. SIPdoi:10.9790/0661-1151220 fatcat:fk3eybrdung4tlpt47uxhqerta