SIP (Session Initiation Protocol) is a protocol used in multimedia communication via IP networks. Provide a framework for setting up voice, video communication in a point-to-point, the Conference and the message text.SIP provides services such as: User Location: determination of the final system to use for the communication. Call Setup: Ringing and set the parameters for the call in both sides Called and Calling. User Availability: determination of the satisfaction of the parties referred to in the media. User Capabilities: determination of means and the parameters of the media used. Call handling: transfer and ends the Call.
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