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4. SIP Method
SIP ¸Þ¼Òµå·Î´Â sessionÀ» °³½ÃÇÏ´Â INVITE, PermanentÁÖ¼Ò¸¦ userÀÇ ÇöÀç À§Ä¡·Î ¼³Á¤ÇÔÀ¸·Î½á User AgentÀÇ contact Á¤º¸¸¦ SIP Server¿¡°Ô µî·ÏÇϵµ·Ï ÇÏ´Â REGISTER, sessionÀÌ ¿¬°á µÇ¾ú´ÂÁö¸¦ È®ÀÎÇÏ´Â ACK(3xx.4xx.5xx.6xxÀÀ´äÀ» º¸³½ ÈÄ ACK ¿äûÀ» ¹ÞÀº proxy¼¹ö´Â To,From,Cseq¿Í Call-ID¸¦ ºñ±³ÇÏ¿© ÀÀ´ä¿¡ ´ëÇÑ ACKÀÎÁö ¾Æ´Ï¸é ´Ù¸¥ ¿äû¿¡ ´ëÇÑ ACKÀÎÁö ±¸º°), ¾ÆÁ÷ response¸¦ ¹ÞÁö ¸øÇÑ INVITE request³ª RingingÀ» Ãë¼ÒÇϵµ·Ï ÇÏ´Â CANCEL, ClientÀÇ sessionÀ» Á¾·áÇÏ´Â BYE°¡ ÀÖ´Ù. À̿ܿ¡µµ OPTIONS, INFO, COMETµîÀÌ ÀÖ´Ù.
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http://mmlab.snu.ac.kr/~scace/project/project.htm
http://www.google.com/search?q=cache:MJ1ZHqB-rBQJ:tenet.knu.ac.kr/research/seminar/jwkim_020615.ppt+invite+message+%EA%B5%AC%EC%84%B1&hl=ko&lr=lang_ko%20target=nw
http://www.cisco.com/univercd/cc/td/doc/product/voice/sipsols/biggulp/bgsipov.htm#xtocid