Also, many of the IP telephony vendors are now focused on SIP as the control protocol for their IP telephony deployments.
另外，许多IP电话技术供应商现在都把SIP作为IP电话技术部署的控制协议。
For example, in voice connections of applications such as IP telephony, the protocol negotiated with SDP in a SIP message is often Real-Time protocol (RTP), which is defined in RFC 3550.
例如，在ip电话等语音应用程序连接中，在SIP消息中使用SDP协商的协议通常是实时协议(Real - Time Protocol,RTP)，而此协议在RFC 3550中定义。
And the successful development and application of IP telephony foreshow the appearance of the new information network basing on IP.
IP网络电话的成功开发和应用预示了以IP为基础的新一代信息网络的出现。
The dial plan is at the very core of any telephony implementation and as such, is one of the most important and complex elements in IP telephony design.
拨号计划是任何电话实施方案的非常核心的部分，也是IP电话设计中最重要最复杂的部分。
Although current IP telephony has reached the general application level, its problems and defects are blocking IP telephony's application in larger ex - tent and scope.
尽管现有IP电话已经能够达到一般的应用级水平，但其现存的问题和缺陷阻碍着IP电话在更大程度和范围内的应用。
SIP is currently the basic signaling and call setup protocol for IP telephony, and SIP applications are the basic way to provide voice and other multimedia services over IP.
SIP是当前IP电话的会话建立和信令控制的基础协议，SIP应用也是实现基于IP网络的语音等多种多媒体应用的基本途径。
IP telephony system can not only provide voice application, but also provide many kinds of intelligent services, it can replace the traditional Private Branch eXchange (PBX) system completely.
IP电话系统不仅能传输话音，而且能提供多种智能服务，完全可以取代传统的个人分支交换(PBX)系统。
The interoperation technology about IP telephony is very concerned now. Some aspects, such as call handling procedures, authentication and authorization procedures, are discussed in this paper.
IP电话的互通问题是目前许多人关注的问题，文章就其中的呼叫控制流程和用户接入认证协议进行了讨论。
The interoperation technology about IP telephony is very concerned now. Some aspects, such as call handling procedures, authentication and authorization procedures, are discussed in this paper.
IP电话的互通问题是目前许多人关注的问题，文章就其中的呼叫控制流程和用户接入认证协议进行了讨论。
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