With the rapid development of internet , the voice over ip services will find a promising market . sp30itg is the ip telephone gateway system manufactured by xi ' an datang telephone corporation , which adopts the widely accepted control signaling hierarchy , that is h . 323 by itu Sp30itg ( sp30iptelephonegateway )是西安大唐电信有限公司研制的ip电话网关系统，采用了目前被广泛接受的voip ( voiceoverip )控制信令体系，即国际电信联盟( itu )的h
Voice over ip ( voip ) is the technology which uses the ip network as the carrier of real time vocal dataflow , to make a communication connection between computers , traditional telephones and both of them . it can also provide the value increment service based on the basic structure of voip Voip ( voiceoverip )是一种利用ip网络作为传输载体实现计算机? ?计算机、普通电话? ?普通电话以及计算机? ?普通电话之间实时语音通信，并提供相应的增值业务的技术。
Voice over ip is a rising technology which has a wide future in application . we can achieve the integration of data network and voice network by voice over ip . it makes possible to communication anytime and anywhere of integrated information as well as saving various precious resources 互联网语音技术是一项有着广阔应用前景的新兴技术,它可以实现数据网与语音网的功能集成,既节约了各种宝贵的资源,也为人们进行随时随地的综合信息交流提供了可能。
In the past decade , great attention has been paid to a new technology named voip ( voice over ip ) , which challenges the traditional pstn telephony with its powerful functions , cheap price and obvious facility . not only voice is supported by voip . , more services such as video , data and fax etc . is also supported 近十年来，一种称为voip ( voiceoverip )的新兴技术受到了世人广泛的关注，它以其强大的功能、低廉的价格以及高度的灵活性对传统的pstn电话提出了强大的挑战， voip不但支持语音的传输，而且能够提供图像、数据以及传真等多种服务。
Compared with traditional telephone , ip telephone is getting more attention for its effective use of network bandwidth , low - cost and provision of diverse add - in services easily . recently , ip telephone tech ( voip - voice over ip ) has made further progresses and improvement , now there are two major protocol stacks , h . 323 protocol stacks put forward by itu - t and sip - based telephone tech by ietf 与传统电话相比， ip电话以其网络带宽利用率高、通话成本低、灵活地提供丰富的增值功能而备受市场的青睐，当前， ip电话技术（ voip ）取得了长足的完善和发展， ip网络电话协议主要有两个，第一个是itu - t提出的h . 323协议栈。
The article particularly discusses ethernet technologies , virtual lans technology , layer3 switching technology , voice over ip technology , and active server pages technology , and introduces technologic details such as topological structure of the whole network , assignment of ip address , choice and configuration of routers and switchers , and the concrete accomplishment and configuration of layer3 switching 本文详细介绍了整个网络的拓扑结构， ip地址的分配，路由器和交换机的选择和配置， vlan划分的原则和配置，第三层交换的具体实现和配置等技术细节，从而揭示了整个网络对这些技术的运用和开创性的工作。
Pcgk ( programmable corba gatekeeper ) supplies powerful service creating and distributing ability , also , corba - based architecture provide it a very flex adapter to communicate with web and other telecommunication networks . further more , security , database , object service are much easy to develop new service logic . in this paper , we described 2 series voice over ip technology h323 and sip , especially the core network of the voip system 随着互联网的出现，产生了许多新的电信应用，多媒体通信也有了较大的发展，电信网、计算机网与电视网之间的三网融合也早已克服技术上的问题，而这3者之间的业务也随之互相渗透，随之而来的就是各自系统相关部分的业务互通。
