IETF (Internet Engineering Task Force) and other working groups have put lot of efforts to come up with a protocol, which could lay standards for Internet Telephony. These efforts gave birth to Session Initiation Protocol (SIP). The imminent acceptance of the SIP as an official IETF standard marks an important milestone to the IP telephony industry. That milestone is the merging of Internet based distributed technologies with traditional telephony. This paper describes what is SIP, its components, its various features and a basic overview of its working.
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