lengxingfei的专栏

续合元：应用软交换技术的策略考虑　摘要，分析了软交换与NGN的不同，重点介绍了软交换组网技术的优势和软交换组网急需解决的问题，并对软交换组网技术的使用提出了一些策略性的建议。　　关键词 下一代网络 游牧 游牧地 SIP C4 C5　　一软交换不等同于NGN　　下一代网络(NGN)是目前电信界热炒的话题，它是在日益增长的业务量、业务种类以及日益激烈的市场竞争环境下，电信业试图利用最新的技术来适应这种

Voip语音网关的X口和O口分别代表什么？网关的RJ11口分为X口和O口两种，全称是FXS和FXO，FXS意指Foreign Exchange Station，是对Station端的接口；FXO意指Foreign Exchange Office，是对Central Office端的接口。简单的说，在模拟(Analog)线路上，FXS的设备会对Station端送出铃流，而FXO的设备会接收来自C

Yes they do. 3GPP adopted SIP in 2001. Your humble slaves were involved in the discussions that preceded that critical decision (i.e. preferring it on H323). 3GPP came up with the IMS (IP Multimedia

PTT stands for Push To Talk. This is the telephony technology which simulates walkie talkie type of communication. It has become very popular in the wireless arena. Typically when people hear this t

Basic wireless/3GPPQuestionsWhat’s the difference between GPRS and UMTS?What’s the relation between GPRS and IP?Can you do voice calls with GPRS?What is the relation between GPRS and SIP?W

SIP OverviewSIP provides the necessary protocol mechanisms so that end systems and proxy servers can provide services: call forwarding, including the equivalent of 700-, 800-

  <!-- Id:samkarkh@cisco.com : Date : 10/09/2003Comment : Blockquotes are very important for indentation -->Table Of ContentsSIP Call T

简介双音多频DTMF（Dual Tone Multi-Frequency）信令，逐渐在全世界范围内使用在按键式电话机上，因其提供更高的拨号速率，迅速取代了传统转盘式电话机使用的拨号脉冲信令。近年来DTMF也应用在交互式控制中，诸如语言菜单、语言邮件、电话银行和ATM终端等。 由于DTMF在传统通信领域中的广泛使用，所以在VOIP中，DTMF仍是发挥着重要的作用。 一个DTM

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