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SIP is distinguished by its proponents for having roots in the Internet community rather than in the telecommunications industry. It has been standardized primarily by the IETF, while other protocols have traditionally been associated with the ITU.
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SIP is designed to be independent of the underlying transport layer protocol and can be used with the UDP, the TCP, and the SCTP. For secure transmissions of SIP messages over insecure network links, the protocol may be encrypted with TLS.
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UDP is officially defined in RFC 768 and was formulated by David P. Reed.
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UDP is widely used in video conferencing and real-time computer games. The protocol permits individual packets to be dropped and UDP packets to be received in a different order than that in which they were sent, allowing for better performance.
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