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SIP was developed by the IETF. To quote " The Tao of the IETF " The internet Engneering Task Force is a loosely self-organized group of people who make technical and other contribution to the engineering and evolution of the Internet and its technologies. RFCs) I-Ds are the working documents of the group; anyone can author one on any topic and sobmit it to the IETF. There is no formal membershipin the IETF; anyone can participate. Every I-D contains the following paragraph on the first page. Internet standards are archived by the IETF as the Request for Comments series of numbered documents. As change are made in a protocol, or new versions come out, a new RFC document with a new number is issued, which "obsoletes" the old RFC. IETF Web site://www.ietf.org.
Posted by linux
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