{"id":3447,"date":"2013-12-25T15:22:28","date_gmt":"2013-12-25T08:22:28","guid":{"rendered":"http:\/\/snt.com.vn\/blog\/?p=3447"},"modified":"2013-12-25T15:22:28","modified_gmt":"2013-12-25T08:22:28","slug":"tim-hi%e1%bb%83u-v%e1%bb%81-giao-th%e1%bb%a9c-kh%e1%bb%9fi-t%e1%ba%a1o-phien-sip-section-initial-protocal","status":"publish","type":"post","link":"https:\/\/snt.com.vn\/blog\/tim-hi%e1%bb%83u-v%e1%bb%81-giao-th%e1%bb%a9c-kh%e1%bb%9fi-t%e1%ba%a1o-phien-sip-section-initial-protocal\/","title":{"rendered":"Giao th\u1ee9c kh\u1edfi t\u1ea1o phi\u00ean SIP (Section Initial Protocal)"},"content":{"rendered":"<p><strong>1.\u00a0T\u1ed5ng quan<\/strong><\/p>\n<p>Giao th\u1ee9c kh\u1edfi t\u1ea1o phi\u00ean SIP (Session Initiation Protocol) l\u00e0 m\u1ed9t giao th\u1ee9c \u0111i\u1ec1u khi\u1ec3n v\u00e0 \u0111\u00e3 \u0111\u01b0\u1ee3c chu\u1ea9n h\u00f3a b\u1edfi IETF. Nhi\u1ec7m v\u1ee5 c\u1ee7a n\u00f3 l\u00e0 thi\u1ebft l\u1eadp, hi\u1ec7u ch\u1ec9nh v\u00e0 x\u00f3a c\u00e1c phi\u00ean l\u00e0m vi\u1ec7c gi\u1eefa ng\u01b0\u1eddi d\u00f9ng. C\u00e1c phi\u00ean l\u00e0m vi\u1ec7c c\u0169ng c\u00f3 th\u1ec3 l\u00e0 h\u1ed9i ngh\u1ecb \u0111a ph\u01b0\u01a1ng ti\u00ean, cu\u1ed9c g\u1ecdi \u0111i\u1ec7n tho\u1ea1i \u0111i\u1ec3m-\u0111i\u1ec3m,\u2026.SIP \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng k\u1ebft h\u1ee3p v\u1edbi c\u00e1c chu\u1ea9n giao th\u1ee9c IETF kh\u00e1c nh\u01b0 l\u00e0 SAP, SDP v\u00e0 MGCP (MEGACO) \u0111\u1ec3 cung c\u1ea5p cho c\u00e1c d\u1ecbch v\u1ee5 VoIP. C\u1ea5u tr\u00fac c\u1ee7a SIP t\u01b0\u01a1ng t\u1ef1 v\u1edbi c\u1ea5u tr\u00fac c\u1ee7a HTTP (giao th\u1ee9c client-server). N\u00f3 bao g\u1ed3m c\u00e1c y\u00eau c\u1ea7u \u0111\u01b0\u1ee3c g\u1edfi \u0111\u1ebfn t\u1eeb ng\u01b0\u1eddi s\u1eed d\u1ee5ng SIP client \u0111\u1ebfn SIP server. Server x\u1eed l\u00fd c\u00e1c y\u00eau c\u1ea7u v\u00e0 \u0111\u00e1p \u1ee9ng \u0111\u1ebfn client. M\u1ed9t th\u00f4ng \u0111i\u1ec7p y\u00eau c\u1ea7u, c\u00f9ng v\u1edbi c\u00e1c th\u00f4ng \u0111i\u1ec7p \u0111\u00e1p \u1ee9ng t\u1ea1o n\u00ean s\u1ef1 th\u1ef1c thi SIP.<\/p>\n<p><strong>SIP l\u00e0 m\u1ed9t c\u00f4ng c\u1ee5 h\u1ed7 tr\u1ee3 h\u1ea5p d\u1eabn \u0111\u1ed1i v\u1edbi \u0111i\u1ec7n tho\u1ea1i IP v\u00ec c\u00e1c l\u00fd do sau:<\/strong><\/p>\n<ul>\n<li>N\u00f3 c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng v\u00f4 tr\u1ea1ng th\u00e1i ho\u1eb7c c\u00f3 tr\u1ea1ng th\u00e1i. V\u00ec v\u1eady, s\u1ef1 ho\u1ea1t \u0111\u1ed9ng v\u00f4 trang th\u00e1i cung c\u1ea5p s\u1ef1 m\u1edf r\u1ed9ng t\u1ed1t do c\u00e1c server kh\u00f4ng ph\u1ea3i duy tr\u00ec th\u00f4ng tin v\u1ec1 tr\u1ea1ng th\u00e1i cu\u1ed9c g\u1ecdi m\u1ed9t khi s\u1ef1 th\u1ef1c hi\u1ec7n (transaction) \u0111\u00e3 \u0111\u01b0\u1ee3c x\u1eed l\u00fd.<\/li>\n<li>N\u00f3 c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng nhi\u1ec1u d\u1ea1ng ho\u1eb7c c\u00fa ph\u00e1p giao th\u1ee9c HTTP (Hypertext Transfer Protocol), v\u00ec v\u1eady, n\u00f3 cung c\u1ea5p m\u1ed9t c\u00e1ch thu\u1eadn l\u1ee3i \u0111\u1ec3 ho\u1ea1t \u0111\u1ed9ng tr\u00ean c\u00e1c tr\u00ecnh duy\u1ec7t.<\/li>\n<li>B\u1ea3n tin SIP (n\u1ed9i dung b\u1ea3n tin) th\u00ec kh\u00f4ng r\u00f5 r\u00e0ng, n\u00f3 c\u00f3 th\u1ec3 l\u00e0 b\u1ea5t c\u1ee9 c\u00fa ph\u00e1p n\u00e0o. V\u00ec v\u1eady, n\u00f3 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c m\u00f4 t\u1ea3 theo nhi\u1ec1u c\u00e1ch. Ch\u1eb3ng h\u1ea1n, n\u00f3 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c m\u00f4 t\u1ea3 v\u1edbi s\u1ef1 m\u1edf r\u1ed9ng th\u01b0 Internet \u0111a m\u1ee5c \u0111\u00edch MINE (Multipurpose Internet Mail Extension) ho\u1eb7c ng\u00f4n ng\u1eef \u0111\u00e1nh d\u1ea5u m\u1edf r\u1ed9ng XML (Extensible Markup Language).<\/li>\n<li>N\u00f3 nh\u1eadn d\u1ea1ng ng\u01b0\u1eddi d\u00f9ng v\u1edbi URL (Uniform Resource Locator) (vd: user@domain.com).<\/li>\n<\/ul>\n<p><strong>N\u00f3i chung, SIP h\u1ed7 tr\u1ee3 c\u00e1c ho\u1ea1t \u0111\u1ed9ng ch\u00ednh sau:<\/strong><\/p>\n<ul>\n<li>\u0110\u1ecbnh v\u1ecb tr\u00ed c\u1ee7a ng\u01b0\u1eddi d\u00f9ng.<\/li>\n<li>\u0110\u1ecbnh media cho phi\u00ean l\u00e0m vi\u1ec7c.<\/li>\n<li>\u0110\u1ecbnh s\u1ef1 s\u1eb5n s\u00e0ng c\u1ee7a ng\u01b0\u1eddi d\u00f9ng \u0111\u1ec3 tham gia v\u00e0o m\u1ed9t phi\u00ean l\u00e0m vi\u1ec7c.<\/li>\n<li>Thi\u1ebft l\u1eadp cu\u1ed9c g\u1ecdi, chuy\u1ec3n cu\u1ed9c g\u1ecdi v\u00e0 k\u1ebft th\u00fac.<\/li>\n<\/ul>\n<div>\n<div style=\"text-align: center;\"><img decoding=\"async\" src=\"http:\/\/fone.sctv.vn\/WebMedia\/RadManager\/Image\/sip.gif\" alt=\"\" \/><\/div>\n<div style=\"text-align: center;\">H\u00ecnh 1: SIP Protocol<\/div>\n<\/div>\n<div><strong>2.\u00a0C\u1ea5u tr\u00fac.<\/strong><\/div>\n<div>M\u1ed9t kh\u00eda c\u1ea1nh kh\u00e1c bi\u1ec7t c\u1ee7a SIP \u0111\u1ed1i v\u1edbi c\u00e1c giao th\u1ee9c x\u1eed l\u00fd cu\u1ed9c g\u1ecdi IP kh\u00e1c l\u00e0 n\u00f3 kh\u00f4ng s\u1eed d\u1ee5ng b\u1ed9 \u0111i\u1ec1u khi\u1ec3n Gateway. N\u00f3 kh\u00f4ng d\u00f9ng kh\u00e1i ni\u1ec7m Gateway\/ b\u1ed9 \u0111i\u1ec1u khi\u1ec3n Gateway nh\u01b0ng n\u00f3 d\u1ef1a v\u00e0o m\u00f4 h\u00ecnh client\/server.<\/div>\n<div><strong>Server:<\/strong> l\u00e0 m\u1ed9t ch\u01b0\u01a1ng tr\u00ecnh \u1ee9ng d\u1ee5ng ch\u1ea5p nh\u1eadn c\u00e1c b\u1ea3n tin y\u00eau c\u1ea7u \u0111\u1ec3 ph\u1ee5c v\u1ee5 c\u00e1c y\u00eau c\u1ea7u n\u00e0y v\u00e0 g\u1eedi tr\u1ea3 c\u00e1c \u0111\u00e1p \u1ee9ng cho c\u00e1c y\u00eau c\u1ea7u \u0111\u00f3. Server l\u00e0 Proxy, Redirect, UAS ho\u1eb7c Registrar.<\/div>\n<div><strong><em>Proxy server<\/em>: <\/strong>l\u00e0 m\u1ed9t ch\u01b0\u01a1ng tr\u00ecnh trung gian, ho\u1ea1t \u0111\u1ed9ng nh\u01b0 l\u00e0 m\u1ed9t server v\u00e0 m\u1ed9t client cho m\u1ee5c \u0111\u00edch t\u1ea1o c\u00e1c y\u00eau c\u1ea7u thay cho c\u00e1c client kh\u00e1c. C\u00e1c y\u00eau c\u1ea7u \u0111\u01b0\u1ee3c ph\u1ee5c v\u1ee5 b\u00ean trong ho\u1eb7c truy\u1ec1n ch\u00fang \u0111\u1ebfn c\u00e1c server kh\u00e1c. M\u1ed9t proxy c\u00f3 th\u1ec3 d\u1ecbch v\u00e0 n\u1ebfu c\u1ea7n thi\u1ebft, c\u00f3 th\u1ec3 t\u1ea1o l\u1ea1i b\u1ea3n tin y\u00eau c\u1ea7u SIP tr\u01b0\u1edbc khi chuy\u1ec3n ch\u00fang \u0111\u1ebfn server kh\u00e1c ho\u1eb7c UA.<\/div>\n<div><strong><em>Redirect server<\/em>: <\/strong>l\u00e0 m\u1ed9t server ch\u1ea5p nh\u1eadn m\u1ed9t y\u00eau c\u1ea7u SIP, \u00e1nh x\u1ea1 \u0111\u1ecba ch\u1ec9 trong y\u00eau c\u1ea7u th\u00e0nh m\u1ed9t \u0111\u1ecba ch\u1ec9 m\u1edbi v\u00e0 tr\u1ea3 l\u1ea1i \u0111\u1ecba ch\u1ec9 n\u00e0y tr\u1edf v\u1ec1 client. Kh\u00f4ng gi\u1ed1ng nh\u01b0 Proxy server, n\u00f3 kh\u00f4ng kh\u1edfi t\u1ea1o m\u1ed9t y\u00eau c\u1ea7u SIP v\u00e0 kh\u00f4ng chuy\u1ec3n c\u00e1c y\u00eau c\u1ea7u \u0111\u1ebfn c\u00e1c Server kh\u00e1c. Kh\u00f4ng gi\u1ed1ng nh\u01b0 Server \u0111\u1ea1i di\u1ec7n ng\u01b0\u1eddi d\u00f9ng UAS, n\u00f3 kh\u00f4ng ch\u1ea5p nh\u1eadn cu\u1ed9c g\u1ecdi.<\/div>\n<div><strong><em>Registrar<\/em>: <\/strong>l\u00e0 m\u1ed9t server ch\u1ea5p nh\u1eadn y\u00eau c\u1ea7u register. M\u1ed9t Registrar \u0111\u01b0\u1ee3c x\u1ebfp \u0111\u1eb7t v\u1edbi m\u1ed9t Proxy ho\u1eb7c m\u1ed9t server g\u1eedi l\u1ea1i v\u00e0 c\u00f3 th\u1ec3 \u0111\u01b0a ra c\u00e1c d\u1ecbch v\u1ee5 \u0111\u1ecbnh v\u1ecb. Registrar \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 \u0111\u0103ng k\u00fd c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng SIP trong mi\u1ec1n SIP v\u00e0 c\u1eadp nh\u1eadt v\u1ecb tr\u00ed hi\u1ec7n t\u1ea1i c\u1ee7a ch\u00fang. M\u1ed9t mi\u1ec1n SIP th\u00ec t\u01b0\u01a1ng t\u1ef1 v\u1edbi m\u1ed9t v\u00f9ng H.323.<\/div>\n<div><strong><em>UA (Uer Agent)<\/em>: <\/strong>l\u00e0 m\u1ed9t \u1ee9ng d\u1ee5ng ch\u1ee9a c\u1ea3 UAC (User Agent Client) v\u00e0 UAS.<\/div>\n<div>\n<ul>\n<li>UAC (User Agent Client): \u0111\u00e2y l\u00e0 ph\u1ea7n ng\u01b0\u1eddi s\u1eed d\u1ee5ng \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 kh\u1edfi t\u1ea1o m\u1ed9t y\u00eau c\u1ea7u SIP t\u1edbi server SIP ho\u1eb7c UAS.<\/li>\n<li>UAS (User Agent Server): l\u00e0 m\u1ed9t \u1ee9ng d\u1ee5ng server giao ti\u1ebfp v\u1edbi ng\u01b0\u1eddi d\u00f9ng khi y\u00eau c\u1ea7u SIP \u0111\u01b0\u1ee3c ch\u1ea5p nh\u1eadn v\u00e0 tr\u1ea3 l\u1ea1i m\u1ed9t \u0111\u00e1p \u1ee9ng \u0111\u1ea1i di\u1ec7n cho ng\u01b0\u1eddi d\u00f9ng.<\/li>\n<\/ul>\n<div><strong>3. M\u1ed9t s\u1ed1 m\u00f4 h\u00ecnh<\/strong><\/p>\n<div style=\"text-align: center;\"><img decoding=\"async\" src=\"http:\/\/fone.sctv.vn\/WebMedia\/RadManager\/Image\/SIP1.JPG\" alt=\"\" \/><\/div>\n<div>\n<div style=\"text-align: center;\">H\u00ecnh 2: Kh\u00f4ng c\u00f3 redirect serve.<\/div>\n<div style=\"text-align: center;\"><img decoding=\"async\" src=\"http:\/\/fone.sctv.vn\/WebMedia\/RadManager\/Image\/SIP2.JPG\" alt=\"\" \/><\/div>\n<div style=\"text-align: center;\">H\u00ecnh 3: C\u00f3 redirect server.<\/div>\n<div style=\"text-align: left;\"><strong>4. \u1ee8ng d\u1ee5ng c\u1ee7a giao th\u1ee9c SIP<\/strong><\/div>\n<div>\n<ul>\n<li>T\u00ecm hi\u1ec3u th\u00eam: <strong><a href=\"http:\/\/www.pcworld.com.vn\/pcworld\/printArticle.asp?atcl_id=5f5e5c595a595d\">T<strong>\u1ea1i \u0111\u00e2y<\/strong><\/a><\/strong><\/li>\n<\/ul>\n<p><em>Ngu\u1ed3n t\u1eeb: <strong>fone.sctv.vn<\/strong><\/em><\/p>\n<ul>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>1.\u00a0T\u1ed5ng quan Giao th\u1ee9c kh\u1edfi t\u1ea1o phi\u00ean SIP (Session Initiation Protocol) l\u00e0 m\u1ed9t giao th\u1ee9c \u0111i\u1ec1u khi\u1ec3n v\u00e0 \u0111\u00e3 \u0111\u01b0\u1ee3c<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11,1],"tags":[147,274],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.2.1 - 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