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Session Initiation Protocol(SIP) is an application layer protocol proposed by the IETF'S. It is mainly a control protocol that controls over the creation , updation, and termination of multimedia sessions such as VoIP(Voice over Internet Protocol). In the SIP VoIP operation, callers and callees are identified via SIP addresses, a caller looks for and locates appropriate SIP server and further sends a SIP request. SIP is a flexible and user friendly protocol which offers all pottentialities of VoIP such as call transfer, call conference, call hold, and name mapping. Moreover, SIP provides redirection services, which supports user mobilty.
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