隨著網路電話(Voice over Internet Protocol;VoIP)技術日益成熟,加上寬頻網路的大量普及,使得語音、數據及影像等服務整合在IP網路上傳送的需求大大的提高。在傳統的電路交換架構中,新的服務通常必須靠軟體升版與硬體更新方能達成,於是以電路交換為基礎的傳統電信技術勢必進展到以封包交換為基礎的新一代網路(Next Generation Network;NGN)技術。而 NGN 的主要精神就是在 IP協定基礎下實現服務與承載分離,服務可以獨立開發與快速導入,同時達成多網融合目標,讓用戶可以在任何時間、地點,以不同之設備使用相同的服務。. 本篇論文針對傳統分時多工(Time-Division Multiplexing;TDM)交換機與新一代NGN交換機骨幹介接方面的技術加以探討,並區分為SS7、SIP和H.323三種不同的信號方式。整個研究偏重利用新一代NGN交換機來與舊有由傳統TDM交換機所組成的公眾電話交換網路(Public Switched Telephone Network;PSTN)網路互連,在不改變使用者的撥號模式下實現VoIP主幹替換架構,並且規劃出一套靈活的路由機制,以達到節省國際電路頻寬與降低局情資料的複雜度之目標。
The demand for transmitting voice, data, and video over IP network has greatly increased with the more and more refined VoIP (Voice over the Internet Protocol) technology and the greater broadband penetration. In the traditional circuit-switched telecommunications network, the implementation of a new service inevitably requires both hardware and software upgrades. As a result, the circuit-switched network is bound to evolve to the packet-switched NGN (Next Generation Network). The NGN aims to separate the service and bearer capabilities on the basis of IP protocol, so that services can be independently developed and quickly deployed. Besides, with multi-network convergence, customers can use the same service in any time and at any place by different equipment. In this thesis, we inquire into the technology of the interconnections between traditional TDM (Time-Division Multiplexing) switches and NGN switches on three different signaling protocols-SS7, SIP, and H.323. The research is focused on how to build the interconnections between NGN switches and existing PSTN (Public Switched Telephone Network) switches, and implement the architecture of VoIP backbone replacement without changing users’ dialing mode. We also plan a flexible routing mechanism to save the bandwidth of international circuits and reduce the complexity of the routing database.
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