目录一、可行性研究的依据和范围依据····························································1范围····························································2IP电话的现状、标准、发展及问题·································22.1IP电话的现状·····················································22.2IP电话标准······················································32.3IP电话的发展····················································62.4IP电话存在的问题················································8三、建设IP电话网必要性与可行性····································93.1建设IP电话网的必要性···········································93.2建设IP电话网的可行性··········································103.3简要结论·······················································11四、IP电话网建设方案··············································114.1总体方案························································114.2实验网业务类型·················································134.3网关及关守的设置方案···········································134.4实验网网路组织·················································164.5协议与信令·····················································244.6IP网关的同步···················································274.7号码与地址·····················································274.8基本业务流程···················································284.9基本通信过程···················································294.10拨号程序······················································314.11用户身份认证··················································314.12计费··························································344.13网络管理······················································354.14业务管理······················································364.15服务质量问题··················································364.16安全性························································38实验网容量、电路估算及能力要求·······························385.1IP电话网的容量及建设规模·······································385.2网关与IP网络互连带宽测算······································435.3IP网关的安装地点···············································