Next is to learn SIP protocol in NGN network, SIP is the Protocol the application layer signaling is used to establish, maintain and end the communication and multimedia. The SIP signalling Protocol plays an important role in the application make the video call between two handsets together. In this chapter I will go deeper into understanding SIP protocol by presenting characteristics, function of the SIP; components and the relationships between the components with each other; along with it is essential on the operation of the SIP, the SIP's newsletter; reviews of SIP; and finally learn about the session description protocol SDP in SIP.
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