VoIP在現今的網路技術已經是非常熱門的一項應用,本論文從電信的角度看待網路電話,在配號規則、伺服器間的架構設計、電信局端效能分析、系統的營運管理…等方面做深入研究分析與實作。 另外網路電信系統於現行網路環境下所需面臨的問題,如在NAT(Network Address Translator)與防火牆之下的通訊限制、即時訊息(語音、影像等)傳輸於網路的干擾等之下的影響,提出網路電信局的概念與架構。 本論文所提出網路電信局具有以下特色: 1. 配置與市話或手機相同的門號,方便記憶與管理,且若撥打對象網路電話用戶不在線上,可以轉接到PSTN、Moblie上相同號碼的用戶。 2. 架構類似於PSTN的階層式電信架構,分層Class#1~Class#N級,可無限擴充,沒有容量限制,易與他局介接。 3. 架構組織易於擴充,透過局與局之間的配合達到穿越防火牆的能力。 4. 利用電信局端效能分析,改進與提升系統至最大容量
VoIP is a very popular application in the telecommunication system. In this thesis, the number planning, co-server architecture, performance analysis of server, operation and management will be analyzed and implemented. Moreover, the firewall issue will also be considered and implemented in this thesis. Some special ideal and new architecture in our research and implementation is listed as below: 1. The Number planning is same as PSTN/ mobile. The fail call of VoIP will be transferred to PSTN/GSM automatically. 2. The class 1~5 of PSTN system architecture will be employed in our VoIP system. 3. Firewall solution is designed for firewall issue. 4. Performance analyzed is inspected detail. The high capacity of server is achieved by this analysis.