High Quality Content by WIKIPEDIA articles! The Session Initiation Protocol is a signaling protocol, widely used for controlling multimedia communication sessions such as voice and video calls over Internet Protocol. The protocol can be used for creating, modifying and terminating two-part or multiparty sessions consisting of one or several media streams. The modification can involve changing addresses or ports, inviting more participants, adding or deleting media streams, etc. Other feasible application examples include video conferencing, streaming multimedia distribution, instant messaging, presence information and online games.

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