【正文】 的網(wǎng)關(guān) (Gateway)，輸入帳號(hào)、密碼，確認(rèn)后鍵入被叫號(hào)碼，這樣本地與遠(yuǎn)端的網(wǎng)絡(luò)電話通過(guò)網(wǎng)關(guān)透過(guò)Inter網(wǎng)絡(luò)進(jìn)行連接，遠(yuǎn)端的 Inter網(wǎng)關(guān)通過(guò)當(dāng)?shù)氐碾娫捑W(wǎng)呼叫被叫用戶，從而完成普通電話客戶之間的電話通信。 隨著 IP 電話的優(yōu)點(diǎn)逐步被人們認(rèn)識(shí)，許多電信公司在此基礎(chǔ)上進(jìn)行了開發(fā)，從而實(shí)現(xiàn)了計(jì)算機(jī)與普通電話之間的通話。 回顧 IP 電話的發(fā)展歷程，著名 IP電話分析家 Jeff Pulver 做出了如下總結(jié)： 這一時(shí)期，使用者大SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesTSelectionParbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbagraphFoLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointse11111111111111111111111111111111lectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraphFormatLineSpaci2222222222222222222222ngLinesToPoints2SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraphFccccccccccccccccccccccccccccccccccccccccccccccccccccccccormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraSelec SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesTSelectionParbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbagraphFoLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointse11111111111111111111111111111111lectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraphFormatLineSpaci2222222222222222222222ngLinesToPoints2SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraphFccccccccccccccccccccccccccccccccccccccccccccccccccccccccormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraSelec 6 多數(shù)是 Inter 上的網(wǎng)迷，語(yǔ)音質(zhì)量基本沒(méi)有保證，技術(shù)還不完全成熟，人們對(duì)它的認(rèn)識(shí)也比較稚嫩，我們也可以把這一時(shí)期 IP電話發(fā)展的萌芽期。網(wǎng)絡(luò)電話、互聯(lián)網(wǎng)電話、經(jīng)濟(jì)電話或者廉價(jià)電話，這些都是人們對(duì) IP 電話的不同稱謂，其實(shí)質(zhì)基本都是一個(gè)意思。 IP 網(wǎng)泛指基本 TCP/IP 協(xié)議的網(wǎng)絡(luò)，包括因特網(wǎng) Inter 和企業(yè)網(wǎng) Inter。SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesTSelectionParbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbagraphFoLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointse11111111111111111111111111111111lectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraphFormatLineSpaci2222222222222222222222ngLinesToPoints2SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraphFccccccccccccccccccccccccccccccccccccccccccccccccccccccccormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraSelec SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesTSelectionParbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbagraphFoLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointse11111111111111111111111111111111lectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraphFormatLineSpaci2222222222222222222222ngLinesToPoints2SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraphFccccccccccccccccccccccccccccccccccccccccccccccccccccccccormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraSelec 1 目 錄 第 1章 緒 論 ??????????????????? 4 VOIP產(chǎn)生的背景 ?????????????? 4 VOIP的發(fā)展情況以及未來(lái)的發(fā)展趨勢(shì) ????? 5 IP電話網(wǎng)和普通電話網(wǎng)傳送的區(qū)別 ?????? 10 VOIP技術(shù)簡(jiǎn)介及應(yīng)用 ???????????? 12 企業(yè) VOIP 網(wǎng)絡(luò)建設(shè)的目的 ?????????? 14 企業(yè) VOIP 網(wǎng)絡(luò)的應(yīng)用特點(diǎn) ?????????? 14 目 前 企 業(yè) VOIP 網(wǎng) 絡(luò) 普 遍 面 臨 和 存 在 的 問(wèn)題 ??? 15 企業(yè) VOIP 網(wǎng)絡(luò)應(yīng)用需求分析 ????????? 16 VOIP網(wǎng)絡(luò)性能需求分析 ???????? 16 VOIP網(wǎng)絡(luò)可靠性需求分析 ??????? 17 VOIP擴(kuò)展性、兼容性需求分析 ????? 17 VOIP網(wǎng)絡(luò)安全性需求分析 ??????? 17 VOIP網(wǎng)絡(luò)計(jì)費(fèi)需求分析 ???????? 17 VOIP網(wǎng)絡(luò)管理需求分析 ???????? 18 本論文的主要工作 ????????????? 18 SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesTSelectionParbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbagraphFoLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointse11111111111111111111111111111111lectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraphFormatLineSpaci2222222222222222222222ngLinesToPoints2SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraphFccccccccccccccccccccccccccccccccccccccccccccccccccccccccormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraSelec SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesTSelectionParbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbagraphFoLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointse11111111111111111111111111111111lectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraphFormatLineSpaci2222222222222222222222ngLinesToPoints2SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraphFccccccccccccccccccccccccccccccccccccccccccccccccccccccccormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraSelec 2 論文的整體結(jié)構(gòu) ??????????? 19 第二