會議初始協定（Session Initiation Protocol, SIP）能有效管理日益普及的多媒體影音服務連線，再加上第三代合作計畫（Third Generation Partnership Project, 3GPP）將其制定為網際網路多媒體子系統（IP Multimedia Subsystem, IMS）內的信號協定，成為目前最熱門的研究方向。SIP可用在會議（session）連線時的控制信號（signaling），負責連線的建立、重送、管理、維護及取消等。而實體資料流（或稱多媒體資料流-media stream）則於會議連線建立完成後傳輸。SIP於信號機制運作期間溝通所得的頻寬資訊，僅止於兩個使用者端的通訊能力及多媒體內容格式的溝通，對於SIP連線建立後的語音通話或視訊會議等的應用品質，卻無法提供一個有效的解決方案。目前的方式，連線建立與服務品質保證兩者被完全獨立分開解決，衍生許多整合上的問題及困難。例如當某網段過於壅塞，而使用者傳輸資料的路徑，仍必須通過該網路時，網路傳輸的品質勢必無法滿足這位使用者的需求。本論文提出一個路徑供裝系統（Path Provisioning System），使用者可藉由代理人（agent）於SIP中透過新增的路徑指定參數 w，指定實體資料流的路徑，再透過SIP中既有的頻寬協商參數 b，預留其所需要的網路頻寬大小。將SIP整合於多重協定標籤交換（Multi-Protocol Label Switch, MPLS）網路環境下，使用者可透過系統動態建立或是解除MPLS網路之穿隧通道（tunnel），提供SIP連線建立後之實體資料流的路徑指定及服務品質保證（Quality of Service, QoS）。透過本論文所開發的管理介面，可正確監測目前MPLS核心網路中，路徑頻寬保留的詳細狀況及歷史記錄。 Session Initiation Protocol (SIP) becomes the hottest research topics now. Because that it can manage audio-video multimedia connections that is popular day by day efficiently and Third Generation Partnership Project（3GPP）makes it to be the internal signaling protocol inside IP Multimedia Subsystem（IMS）. The operation way of SIP is a signaling mechanism during a session. It is responsible for the setting-up, re-transmission, management, maintenance and cancel of the connection. Data stream (or called media stream) transmits after the finish of setting-up the session connection. The information of bandwidth in SIP that is obtained during the operation of signaling mechanism is only the one that used to negotiate capabilities and required contents between two end users. SIP can not offer an effective solution to get better quality in audio connections or video sessions after setting-up it. In a present way, setting-up connections and the quality of service is resolved independently totally. It would cause a lot of questions and difficulties during integrating them. When a certain network is crowded, and a path of a user’s packet will pass through the network. The quality of that crowded one is impossible to make the user feel satisfied. Our thesis propose a Path Provisioning System. Users can pass their data through the desinating way that they make it by added path parameter w and reserve bandwidth by bandwidth paramete b in SIP by agent.To integrate SIP into Multi-Protocol Label Switch(MPLS) network environment, users can create or crash MPLS tunnel. It provides the ability of desinating path of media stream after SIP connection setting-up and reserve bandwidth to support Quality of Service(QoS). By the management interface of this theiss, administrator can monitor the detail status and history of path and reserved bandwidth in current MPLS core network.
