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研究生(外文):Meng-Chieh Huang
論文名稱(外文):The Design and Implementation of the Mobile Voice over Internet Protocol System
指導教授(外文):Chyi-Nan Chen
外文關鍵詞:VoIPWireless networkIP-phonegatekeepergatewayitg
  • 被引用被引用:9
  • 點閱點閱:1246
  • 評分評分:
  • 下載下載:342
  • 收藏至我的研究室書目清單書目收藏:7
This paper’s main purpose is to establish a Mobile Voice over Internet Protocol (MVOIP) system in the 4GL (4G-Like) environment. 4GL to use as Internet for the backbone to integrate with wireless local area network, GSM, and PSTN.MVOIP proffer users can make a phone call two-way and have roaming ability on the 4GL envirommrnt.In this paper, we discuss some problems about MVOIP as listed below:(1)how to select voice buffer size,(2)jitter and delay solutions,(3)sort packet againt,(4)Mcma IP and phone number comparision,(5)protocol operation modle…etc.Out contribution is that we develop a new application in a new integration environment.
1、緒論 1
2、相關研究 3
2.1 PSTN 3
2.1.1 電話訊號分類[20] 4
2.1.2 電話系統的運作 5
2.2 Mobile IP 9
2.3 H.323 12
2.3.1 H.323內部元件 12
2.3.2 H.323的資料流與Channel 15
2.3.3 H.323電話系統運作模式 17
2.4 TCP、UDP & RTP 18
2.4.1TCP 18
2.4.2 UDP(User Data-gram Protocol) 21
2.4.3 RTP(Real-time Transport Protocol) 21
2.5網路電話設計的種類 22
2.6 SIP(Session Initiation Protocol) 27
3、系統設計 31
3.1 4GL執行平台簡介 31
3.2 系統設計考量 34
3.2.1 VOIP與PSTN的不同 34
3.2.2 訊號和資料路線的分離 34
3.2.3 語音緩衝區的大小 35
3.2.4 TCP與UDP的選擇 35
3.2.5 電話號碼之設定 36
3.3系統運作模式 37
3.3.1系統命令 37
3.3.2運作模式 38
3.4系統元件設計 57
3.4.1行動電腦 57
3.4.2網路電話閘道器(ITG) 59
3.4.3閘道器管理者(Gatekeeper) 61
4、系統實作 66
4.1封包格式 66
4.2號碼判斷流程 68
4.3 MVOIP音效緩衝區的設計與處理 70
4.3.1系統的延遲 71
4.3.2錄音與播音緩衝區大小的取捨 74
4.3.3封包重新定序的處理 79
5、結論與未來工作 80
6、參考文獻 82
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