【正文】 Via: SIP/ 。branch= 。received= Via: SIP/ 。branch=z9hG4bK776asdhds 。received= MaxForwards: 69 To: Bob sip: From: Alice sip:。tag=1928301774 CallID: CSeq: 314159 INVITE Contact: sip: ContentType: application/sdp ContentLength: 142 (Alice39。s SDP not shown) Via Header for Alice’s phone Via Header for zzz server MaxForwards decreases 1 James Polk 20050503 INVITE INVITE Alice Bob 透過 Proxy Server SIP Proxy “” 200 OK SIP/ 200 OK Via: SIP/ 。branch= 。received= Via: SIP/ 。branch=z9hG4bKnashds8 。received= To: Bob sip:。tag=a6c85cf From: Alice sip:。tag=1928301774 CallID: CSeq: 314159 INVITE Contact: sip: ContentType: application/sdp ContentLength: 131 (Bob39。s SDP not shown) Notice both Via headers INVITE INVITE 200 OK Alice Bob 透過 Proxy Server SIP Proxy “” 200 OK SIP/ 200 OK Via: SIP/ 。branch=z9hG4bKnashds8 。received= To: Bob sip:。tag=a6c85cf From: Alice sip:。tag=1928301774 CallID: CSeq: 314159 INVITE Contact: sip: ContentType: application/sdp ContentLength: 131 (Bob39。s SDP not shown) Notice one Via header INVITE INVITE 200 OK 200 OK Alice Bob 透過 Proxy Server ACK ACK sip: SIP/ Via: SIP/ 。branch=z9hG4bKnashds8 MaxForwards: 70 To: Bob sip:。tag=a6c85cf From: Alice sip:。tag=1928301774 CallID: CSeq: 314159 ACK ContentLength: 0 SIP Proxy “” INVITE INVITE 200 OK 200 OK Session Established Alice Bob 透過 Proxy Server ACK SIP Proxy “” INVITE INVITE 200 OK 200 OK Session Established Alice Bob 透過 Proxy Server ACK SIP Proxy “” BYE sip: SIP/ Via: SIP/。branch=z9hG4bKnashds8 MaxForwards: 70 From: Bob sip:。tag=a6c85cf To: Alice sip:。tag=1928301774 CallID: CSeq: 231 BYE ContentLength: 0 BYE INVITE INVITE 200 OK 200 OK Session Established Alice Bob 透過 Proxy Server ACK BYE SIP Proxy “” 200 OK SIP/ 200 OK Via: SIP/From: Alice sip:。tag=1928301774 To: Bob sip:。tag=a6c85cf CallID: CSeq: 231 BYE ContentLength: 0 Alice SIP Methods: REGISTER REGISTER – 註冊 ?SIP URI 稱之為 Address of Record (AOR) ?把一個 AOR和現在可以連繫得上的實際位址對應連接在一起 ?讓 UA可以收到 SIP的訊息 ?UAs可以利用下列方法向伺服器註冊 ? 手動設定 ? AddressofRecord ? Multicast [] REGISTER REGISTER sip: SIP/ Via: SIP/ 。branch=z9hG4bk2l55n1 To: Alice sip: From: Alice sip:。tag=283074 CallID: CSeq: 31862 REGISTER Contact: sip: Expires: 21600 ContentLength: 0 SIP Registrar Server REGISTER Alice SIP Methods: REGISTER SIP Registrar Server 200 OK SIP/ 200 OK Via: SIP/ 。branch=z9hG4bk2l55n1。 received= To: Alice sip:。 tag=a6c85e3 From: Alice sip:。tag=283074 CallID: CSeq: 31862 REGISTER Contact: sip: Contact: sip: Expires: 3600 ContactLength: 0 ?200 (OK) 回應包含一連串的 Contact ?Expires Header 告知 UA註冊的有效期限 REGISTER 通常是需要經過密碼認證的 Call Forking INVITE Alice INVITE INVITE Office Phone Bob’s Notebook Bob’s Mobile phone Bob’s 同時嚮，看哪一個先接！ Alice Bob SIP Methods: MESSAGE (RFC3428) ?MESSAGE ?以 近乎 即時的方式傳送 ?存在在 MIME的主體中 ?不會啓始新的 dialogs ?訊息之間沒有任何關聯 ?不可以超過 1300 bytes MESSAGE sip: SIP/ Via: SIP/ 。branch=z9hG4bK776asegma MaxForwards: 70 To: Bob sip: From: Alice sip:。tag=1928301774 CallID: CSeq: 22756 MESSAGE ContentType: text/plain ContentDisposition: render ContentLength: 37 Isn’t this a great presentation, Bob? MESSAGE Alice Bob SIP Methods: MESSAGE (RFC3428) MESSAGE 200 OK SIP/ 200 OK Via: SIP/。branch=z9hG4bKnashds7。 received= To: sip: sip:。 tag=a6c85e3 From: 。tag=1928301774 CallID: CSeq: 22756 MESSAGE ContentLength: 0 參考文獻 謝謝觀看 /歡迎下載 BY FAITH I MEAN A VISION OF GOOD ONE CHERISHES AND THE ENTHUSIASM THAT PUSHES ONE TO SEEK ITS FULFILLMENT REGARDLESS OF OBSTACLES. BY FAITH I BY FAITH