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.This is a standard of the IETF to establish VoIP connections. It is an application layer protocol to create, edit and end the session. SIP HTTP-like structure (client-server protocol). The Request generated by the Client and sent to the Server. The server handles the Request and sends a Response back to the Client. A Request and Response is a request to create an interaction back and forth. SIP can also INVITE messages and ACK. SIP generated the smallest assumptions about the Transport Protocol's Basic. This Protocol itself provides reliability and it does not depend on the reliability of TCP. SIP depends on the Session Description Protocol (SDP) in carrying out the agreement to verify codec. SIP support the description of the session which allows the parties involved may agree to set the media type is compatible.
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