Unit 5 Components Of SIP

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SIP is the application layer control protocol of VOIP which is used for creating ,modifying and terminating a sessions with one or more than one participants.it is a client server protocol, in which client generates a requests and sends it to the server and server process the requests and send it back to the client. SIP provides various services such as User location, User availability, user capability, call setup, call handling. SIP consists of two main components i.e. user agents and network servers. User agent comprises of client and server. The client portion is called UAC that is used to generate SIP requests and the server portion is called UAS that is used to receive requests and return response to the client. SIP uses various messages

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