基于第三方攻击的VoIP并联控制技术

随着VoIP的普及,对VoIP监测的需求愈加迫切,目前,传统的VoIP控制方式已无法满足现实的需要。文章简单介绍了VoIP基础,分析了VoIP信令流与媒体流交互的过程及VoIP传统的串联控制方式。在此基础上,分析和研究基于第三方攻击的VoIP并联控制方式,最后给出了并联控制方式下的VoIP控制系统模型及其在实际系统中的应用。     

浅谈VoIP网络及其安全性分析

IP网上语音(VoIP)网络已逐步得到了广泛地应用,但随之而来的安全性问题也越来越突出,文章介绍了VoIP网络的基本原理及其主要的协议标准和体系结构。从分析VoIP网络安全的重要性入手,对VoIP网络存在的安全隐患进行了分析,并给出了加强VoIP网络安全性的建议和方案。     

反垃圾VoIP关键技术研究

随着VoIP技术和需求的发展,垃圾VoIP逐渐成为网络应用的一大安全威胁.本文介绍了构建VoIP系统的两种标准:H.323协议和SIP协议,分析了反垃圾VoIP的关键技术.最后对反垃圾VoIP技术的发展趋势进行了展望.     

基于Bluetooth的VoIP系统设计

通过分析现有的VoIP业务的缺点,提出了一种基于Bluetooth无线传输技术的全新VoIP通话系统.在简要分析了Bluetooth和VoIP技术的基础上,给出了这种系统的具体实现方案,对系统的实现原理和组成结构进行了详细的分析,同时还给出了VoIP客户端的软件设计漉程.     

VoIP在广电FTTH网络中的应用

本文分析了三网融合的现状,介绍了VoIP原理和关键技术、VoIP的发展状况,并结合广电双向网络FTTH的组网优势及具体案例分析VoIP存广电FTTH中的应用。     

关于下一代网络VoIP业务的QoS体系结构研究

如何保证VOIP的QoS是VoIP网络向NGN日标演进必须解决的问题。本文分析了目前VoIP 网络中存在的问题,针对VoIP的Qos需求,阐述了下一代网络支持VoIP Qos保证的技术和机制,并且 提出了一种基于SIP的下一代网络VoIP Qos体系结构。     

VoIP网络信息安全研究

VoIP是基于分组交换的话音传输技术,与基于电路交换的传统电话架构有很大的不同。导致了VoIP网络特有的安全问题。另外,VoIP网络的实时性要求高,由于IP网络服务自身的特性以及各种安全策略的应用,给VoIP网络的性能和服务质量提出了挑战。对VoIP网络存在的安全威胁及各种安全措施进行分析,并对VoIP系统的部署和VoIP管理政策的制定提出建议。     

我国VoIP产业的特征分析

为了给公众、学术界及产业政策决策机构提供有价值的参考,围绕VoIP这一新兴产业的特征进行了分析研究.在介绍VoIP产业背后的技术特征之后,分析得出了我国VoIP产业的4个显著产业特性,基于此,指出我国VoIP产业价值链存在的若干亟待考虑和解决的问题.     

下一代VoIP协议探讨

我国VoIP已经到了需要有新的起色的关头.业务的个性化和多样性的特点是VoIP发展的考虑重点,选择合理的技术来支持是发展的关键,目前可用来实现VoIP的协议有多种,本文重点分析了各种VoIP协议的特点以及下一代VoIP需要重点考虑的问题。     

非法VoIP行为检测与管控方法的实现

由于IP网络的开放性和自由性,以及VoIP接入技术的简单易行,非法VoIP业务的管控工作具有重要意义。对VoIP业务监控主要可通过实时监测并分析网络协议,结合流量分析技术的方法,对采集来的流量进行VoIP业务的连接控制协议分析和数据流分析,检测出所有的VoIP业务流量,并判断是否合法。     

实施VoIP过程中的安全性考虑

随着 VoIP(Voice over IP)技术在全球电信市场的不断普及,VoIP的安全问题迫切需要得到解决,而这也是运营商开展业务的前提.VoIP安全可以分为业务的正常提供、业务内容的保密、呼叫者身份确认和系统安全等.文章分析了VoIP目前存在的安全威胁及其相应的防范措施.     

基于Trixbox的VoIP网络电话系统应用探讨

介绍了VoIP网络电话特点和应用现状,研究了Trixbox开源软件的结构、组成特点。设计了网络电话的系统结构,从服务器系统配置出发,重点讨论了VoIP网络电话系统图形化配置方案。针对IP网络电话安全问题提出了若干解决方案,对于搭建中小企业网络电话服务平台具有借鉴意义。     

基于BCM1101的单芯片VoIP电话设计

讨论了基于美国BROADCOM公司的BCM1101单芯片的VoIP电话设计方案及软硬件实现。首先介绍了基于H．323协议的VoIP工作原理,然后对目前常用的一些VoIP设计方案进行了简单比较,最后给出了基于BCM1101单芯/片的VoIP电话设计方案的软硬件具体实现。     

SIP协议穿透NAT网关的研究

详细分析了SIP协议的IP电话穿透NAT的问题所在。提出了适合于SIP电话终端的穿透方案，通过在SIP电话终端中的具体部署和实现以及测试，验证了电话终端程序穿透NAT方案的可行性，解决了部分NAT穿透的问题。     

Quality VoIP — An Engineering Challenge

Initial impressions of VoIP quality have not always been favourable. This paper discusses the issues behind delivering an 'appropriate' quality of service, specifically voice quality, by showing how design choices ultimately affect, and potentially limit, a customer's perception of VoIP quality.The paper continues by introducing new signal processing techniques that are helping to measure and optimise the performance of VoIP solutions.     

Security Challenge and Defense in VoIP Infrastructures

Voice over Internet protocol (VoIP) has become a popular alternative to traditional public-switched telephone network (PSTN) networks that provides advantages of low cost and flexible advanced ldquodigitalrdquo features. The flexibility of the VoIP system and the convergence of voice and data networks brings with it additional security risks. These are in addition to the common security concerns faced by the underlying IP data network facilities that a VoIP system relies on. The result being that the VoIP network further complicates the security assurance mission faced by enterprises employing this technology. It is time to document various security issues that a VoIP infrastructure may face and analyze the challenges and solutions that may guide future research and development efforts. In this paper, we examine and investigate the concerns and requirements of VoIP security. After a thorough review of security issues and defense mechanisms, we focus on attacks and countermeasures unique to VoIP systems that are essential for current and future VoIP implantations. Then, we analyze two popular industry best practices for securing VoIP networks and conclude this paper with further discussion on future research directions. This paper aims to direct future research efforts and to offer helpful guidelines for practitioners.     

DH密钥体制在VoIP通信中的应用

随着通信网络与计算机技术的飞速发展,通信业务也逐渐多样化。VoIP逐渐成为当前通信网络发展的主流,DH密钥协商体制作为保证VoIP网络通信安全的重要技术越来越受到重视。首先介绍DH密钥协商体制的基本原理,分析了其在VoIP通信系统中应用所存在的安全隐患和可能遭受的攻击,针对不用应用需求提出了两种解决方案,有效解决DH密钥体制在合法身份认证方面的缺陷,提高了VoIP通信系统中密钥协商的安全性,具有一定的实用价值。     

Voice over IP signaling: H.323 and beyond

Signaling has been one of the key areas of Voice over IP (VoIP) technologies since inception. H.323 was the key protocol that allowed interoperability of VoIP products and moved the industry away from the initial proprietary solutions. Once the VoIP industry started maturing, some limitations of H.323 came to light. In this article we provide an overview of H.323, describe its capabilities, and discuss how its limitations are being addressed using the concept of gateway decomposition. We also discuss how H.323 can coexist with other protocols such as MGCP, H.248, and SIP which are attracting a lot of interest in the VoIP industry today     

Evaluating VoIP Technology — Technology Push/Market Pull

With many raised expectations of what it will offer, voice over IP has enjoyed a high profile in the communications industry. However, in common with any emerging technology, the reality of the functionality that available equipment can deliver is often at variance with such expectations. This paper highlights the role of technology assessment in refining VoIP products and highlights the value of such activities from a number of perspectives. It describes an approach to evaluate VoIP solutions, the problems associated with the testing of VoIP networks and network components, and the tools and techniques employed to do so. The paper also outlines the capabilities of the BTexaCT VoIP technology evaluation test bed, and example case studies of detailed evaluation and testing.     

VoIP — The Access Dimension

For a given voice quality, VoIP does not offer a particularly efficient transport solution. This becomes a concern in any bandwidth-constrained part of a network, in particular, a copper-based, access network. VoIP access systems need to be carefully designed if they are to offer an acceptable combination of quality and efficiency. This paper identifies and quantifies the various issues which need to be addressed in undertaking such a design, and suggests possible solutions. The challenges of distributing VoIP within the customer premises are also addressed, with specific and different solutions being proposed for the business and residential environments.