【作者】 王康；

【导师】 吴国新；

【作者基本信息】 东南大学 ， 计算机应用技术， 2006， 硕士

【摘要】 随着VoIP技术的不断发展和成熟,各种形态的VoIP应用层出不穷,并以其低廉的价格吸引了众多的用户,对传统的PSTN语音业务产生了巨大的冲击。由于其业务实现的简单性和灵活性,很多地下运营组织大肆利用基础电信运营商的网络资源开展非法VoIP的业务经营,这种行为,不但超出了《电信业务分类目录》明文规定的业务范围,违反了国家对于VoIP业务的监管政策,对国家信息安全和社会造成了危害,而且严重干扰了电信市场的正常运营秩序,分流了大量基础运营商的长途话务,给传统电信运营商带来了不可估量的经济损失。因此,加大对非法VoIP业务的监管和打击力度势在必行。除了继续运用法律武器对VoIP市场进行必要的规范和净化外,在当前阶段,研究和探讨如何采用一些技术手段对非法VoIP业务实施精确的检测和打击是当前电信运营商所重点关注的问题。在此背景下,扬州电信设立“非法VoIP检测和限制系统”项目,通过对VoIP技术实现原理的解剖,分析和探讨VoIP检测和限制的机理,最终形成一个完整的系统解决方案,从而达到可实际部署运用的目的。本文首先对VoIP和VoIP协议技术进行了全面介绍,详细分析了VoIP信令流和媒体流实现的过程,着重分析了基于H.323和SIP两大主流VoIP协议的呼叫建立流程以及媒体传输过程,在此基础上,分析和研究了VoIP检测、阻断、干扰三大机理,并总结出了非法VoIP检测和限制系统的实现流程,最后探讨了系统的部署及应用,给出了扬州电信城域网出口方式的系统部署方案。本论文研究实践内容同时也作为江苏省电信公司的试点项目。更多还原

【Abstract】 With the VoIP technology developing, lots of new VoIP applications strongly attracted users by lowest price but at the same time brought huge impact to the traditional PSTN voice services. Because of the simplicity and flexibility of VoIP deployment, many secret organizations want to provide the illegal VoIP services supported by the network resources owned by legal telecommunication companies. These behaviors, not premised by TSCC(Telecommunication Service Classified Catalogue), have many serious disadvantages, such as violating the country policy of supervising and managing the VoIP services, seriously disturbing the normal order of telecommunication market, diverging the massive businesses of long-distance telephone, and the inestimable economic loss for the traditional telecommunication operation business ,even threatening country information and society security. Therefore, it is emergent to increase efforts in monitoring on illegal VoIP services. Besides continuing carrying on the essential standard and the purification to the VoIP market using the legal instrument, the most important task is studying and discussing how to use advanced technical methods to inspect and attack the illegal VoIP service.Under this background, Yangzhou telecommunication established a project on the Illegal VoIP examination and limit system. Through the dissection to the VoIP technology realization principle, it analyzed and discussed the VoIP examination and limitation mechanism, and finally formed a systematic solution.Firstly this article carries on the comprehensive introduction to VoIP and the VoIP agreement technology, and analyzes the process of realization of VoIP signaling flows and the media flows, also analyzes the process of the call setup as well as the media transmission. Secondly it analyzes and studied three main mechanisms of examination and blocking and disturbing the VoIP packages, then summarizes the realization process of illegal VoIP recognizing and limiting system. Finally discusses the system deployment and application, and produces system deployment plan of the Yangzhou telecommunication city territory net exportation.This paper does some research on the practice content and at the same time it is the experiment site project of Jiangsu Province Telecommunication Company.更多还原