共查询到19条相似文献,搜索用时 296 毫秒
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Vo IP属于通信方法之一,又被称为网络电话或互联网语音协议。目前,许多组织机构或企业都已了使用VoIP通信系统。然而,通信安全问题会影响VoIP通信系统所提供的服务质量。出于安全考虑,运用WLAN、防火墙和SIP安全技术设计并实现了一个VoIP网络安全系统,并在设计中同时考虑了VoIP通信服务的服务质量(QoS)。 相似文献
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VoIP(Voice over IP)俗称IP电话(Internet Protocol Phone),是利用IP网络实现语音通信的一种先进通信手段,是基于IP网络的语音传输技术。随着VoIP技术的发展,逐渐出现了一种新的业务提供商,即VoIP业务提供商(ITSP,Internet Telephone Services Provider)。这些ITSP主要来自ISP、电信公司甚至是有线电视公司。 相似文献
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基于H.323的VoIP系统QoS实现研究 总被引:4,自引:1,他引:3
文章提出了一种QoS增强的VoIP体系结构,增加了连接准入控制功能,提供了语音分组的IP优先服务,并改进了抖动缓冲的设计,使VoIP系统的QoS得到很大改善。 相似文献
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VoIP(语音IP)或互联网电话技术是指通过互联网(而非公共交换电话网络,亦即PSTN)传送的通信服务--语音、传真和/或语音、信息应用. 相似文献
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在MPLS网络中如何保证VoIP的QoS 总被引:1,自引:0,他引:1
在以IP为基础的网络中,IP网络上传送语音(VoIP)成为新一代语音系统的代表,但其业务质量因由IP网络承载而受到限制.多协议标签交换(MPLS)是当前被普遍看好的高速骨干网络技术,通过MPLS,第三层的路由可以得到第二层技术的很好补充,以保证端到端的服务质量(QoS).将MPLS的QoS特性与区分服务(DiffServ)相结合,可实现更优化的网络业务QoS. 相似文献
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介绍了最新的基于因特网的语音技术。在该方案设计中采用了融合传统电路交换网和IP网的结构思想,不仅将语音的传输放到了IP网上,更为集成将来的业务,诸如网页、电子邮件、多媒体技术等提供了灵活的结构。其初期目的在于替代传统的企业级电话业务。 相似文献
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近年来,我国的电力企业取得了卓有成效的发展成就,电力通信业务突破了传统程控语音通信等单一的业务模式,逐渐朝着网络融合方向发展.传统的程控交换技术仅能够提供语音通话服务,难以满足多样化综合业务需求,因此,必须探索新的能够实现对电话交换网管理的新型通信技术.此次研究将宽带IP技术作为基础,结合最新通信技术软交换系统,在信令控制及媒体处理技术支持下,构建了电力程控交换中心软交换组网系统平台,为企业生产及通信业务发展提供帮助. 相似文献
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H. Leopold 《e & i Elektrotechnik und Informationstechnik》1998,115(6):274-284
Although ATM was conceived as a networking technology for multimedia communications currently ATM is to large extent employed as a backbone technology in the wide area telephone networks and for carrying Internet traffic between conventional LANs. Consequently, there is a large motivation to integrate ATM technology with Internet technology. It has to be expected that the basically different communication concepts “connectionless” and “connection oriented” will be increasingly merged in the future. This merging is already highlighted by the ongoing discussion of an efficient ATM/IP-integration. The purpose of this paper is to investigate the lates advances in ATM technology as well as in Internet technology and the different approaches for ATM/IP integration. 相似文献
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Ahmed H.M. Gallon R. Malis Moy J. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1997,85(12):1984-1997
Internet protocol (IP) switching is emerging as a critical technology for improving the speed and scalability of the Internet. This paper discusses IP Navigator, a form of IP switching developed specifically for use in core network backbones, such as Internet service provider networks and major corporate backbones. IP Navigator combines the high speed and quality of service capabilities of asynchronous transfer mode (ATM) with the scalability and flexibility of IP. This paper presents an overview of the techniques that have been developed for operating IP over ATM. We outline the IP Navigator design and compare IP Navigator with other IP switching approaches 相似文献
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本文先简单说明传统公用电话网的电路交换和数据通信网的分组交换原理。然后介绍语音压缩和分组语音技术在互联网和内部网上的应用 ,以实现互联网电话的新趋向。 相似文献
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Maresca M. Zingirian N. Baglietto P. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》2004,92(9):1463-1477
In this paper, we consider the evolution of telephone networks from time-division multiplexing circuit switching to packet switching and, in particular, to packet switching-based on Internet Protocol (IP-supported telephony). We analyze IP-supported telephony design solutions by proposing a layered reference model in which each layer is associated to a subset of the functions that support telephony. We use the reference model to establish a terminology and a framework for the comparison of the design solutions. We group the design solutions in scenarios and compare them in terms of the reference model proposed. We then focus on IP telephony, in which IP is used in telephone company networks, and on Internet telephony, in which the Internet is used to support telephony. We show that they both can be seen as implementations of the same architecture, which consists of a set of components, associated to functions, and of the interactions among these components. We then consider the issue of voice-data integration and analyze the variety of design solutions that can be adopted to integrate voice and data. 相似文献
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探讨了光互联网的支撑技术和演进策略,分析了IP over DWDM等关键支撑技术的难点与发展趋势。首先,比较分析了若干种典型的网络层次模型及其性能,指出IP over DWDM是实现未来宽带互联网的关键支撑技术;其次,分析了IP over DWDM的技术难点,指出全光信号处理和多协议标签交换技术是实现IP over DWDM的重要手段,并预言了在相关技术成熟后,光分组网技术将进一步推动光互联网的发展。 相似文献
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基于互联网的VoIP业务,也就是所谓的IP电话,它是一种新的数字传输技术.文中提出了基于AVR处理器的模块化结构设计方案,并具体介绍了CPU和外设模块的接口和实际芯片的选择,描绘了VoIP的原理,整个系统组成,硬件结构设计,外围配置电路,系统软件设计,特别是修改了uIP协议栈的移值,以及终端具体实现过程.基于功能的模块化设计结构清晰,接口方案易于搭建,实时性好,可靠性高. 相似文献