本文的目的是在一個階層式SIP的網路環境(Hierarchical SIP Networks Environment)上建立一個行動網際網路電話系統(MVoIP)，階層式SIP環境以Internet為骨幹，結合了區域無線網路、GSM、PSTN，MVoIP則提供在階層式SIP環境上的使用者可以相互撥打電話，並具有漫遊功能。在本論文中為了提供使用者在漫遊時擁有更佳的通話品質，提出了Media-Relay的方法，藉此減低漫遊時所產生的遞移延遲 (handoff delay)。本論文的貢獻是在一個階層式SIP網路環境上建立新的網際網路電話系統，並賦予漫遊的功能。

　　This main purpose of this paper is to establish a Mobile Voice over Internet Protocol (MVoIP) system under the environment of a hierarchical SIP networks environment. The hierarchical SIP networks environment integrate 4 kinds of networks: Internet, WLAN, GSM, and PSTN, Internet is used as the backbone. MVoIP provide the users to make a phone call each other and have the ability of roaming around the integrated network. In order to reduce the delay of handoff, a method of Media-Relay is used in the system. The major contribution of this paper is to build up a new VoIP system with roaming ability in the hierarchical SIP networks environment.

中文摘要 I
Abstract II
誌謝 III
目錄 IV
表目錄 VI
圖目錄 VII

1、 序論 1
2、 相關研究 4
2.1 Voice Over IP (VoIP) 4
2.2 SIP (Session Initiation Protocol) 簡介 6
2.2.1 SIP 元件介紹 7
2.2.2 SIP命名方式 9
2.2.3 SIP message 9
2.2.4 SDP 11
2.2.5 SIP運作模式 13
2.2.4.1 SIP proxy 模式 13
2.2.4.2 SIP redirect 模式 14
2.2.6 ENUM 15
2.3 Mobility 的支援 18
2.3.1 MIP的運作流程 18
2.3.2 SIP對移動性的支援[20][21][22][23] 20
2.4 Voice Over IP (VoIP) 相關協定 24
2.4.1 H.323 [24][25] 24
2.4.2 MGCP [26] 25
2.4.3 H.323、MGCP、SIP的比較 27
3、 執行平台設計 28
3.1 階層式SIP執行平台簡介 28
3.2 MVoIP設計考量 30
3.2.1 整合VoIP 與PSTN 30
3.2.2 電話號碼設定 30
3.2.3 快速遞移的實現 31
3.2.4 控制訊號與語音資料分離 33
3.2.5 漫遊的支援 33
3.4 MVoIP運作模式 37
3.4.1 呼叫建立 (Call Setup) 37
3.4.2 遞移 (Handoff) 39
3.4.2.1 區域交遞 (Intra-domain Handoff) 42
3.4.2.2 全域交遞 (Inter-domain Handoff) 44
3.5 MVoIP對Mobility的支援 45
3.5.1 Session Mobility 45
3.5.2 Terminal Mobility 48
3.6 系統元件設計 50
3.6.1 使用者終端設備 50
3.6.2 Gatekeeper 51
3.6.2.1 Gatekeeper 功能 51
3.6.2.2 Gatekeeper 軟體元件說明 52
3.5.2.3 Gatekeeper運作流程 55
3.5.2.4 Gatekeeper號碼判斷流程 57
3.6.3 Internet Telephone Gateway (ITG) 59
3.5.3.1 ITG卡的功能 59
3.5.3.2 ITG軟體元件說明 60
3.5.3.3 ITG軟體運作流程 62
3.6.4 Media Relay Server 66
3.5.4.1 Media Relay Server的功能 66
3.5.4.2 Media Relay Server軟體元件說明 67
3.5.3.3 Media Relay Server軟體運作流程 68
4、系統實做 71
4.1 作業平臺與開發工具 71
4.2 系統效能與量測 73
5、結論與未來工作 78
參考文獻 80

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