【作者】 邢志岩；

【导师】 孙建伟；

【作者基本信息】 中国科学院研究生院（沈阳计算技术研究所） ， 计算机应用技术， 2010， 硕士

【摘要】 随着VoIP业务逐渐为广大消费者所熟悉,IP语音网关作为IP电话系统的重要组成部分已具备较大的市场和应用规模。传真通信作为传统的传输静态图像的手段,由于其具备一定法律效力、用户使用习惯和方便性,它仍然是公共电话网上的一个基本业务。因此在IP语音网关中集成传真的功能已成为迫切的需求。论文结合中国科学院沈阳计算技术研究所网络与通讯实验室的自主研发项目SIPSYS蓝蜻蜓IAD-08O语音网关,简单介绍了传真机的分类以及传真通信的发展历程,研究了三类传真机通信的基本原理以及相关的ITU-T T.4、T.30协议、信源编码、信道编码以及V系列传真调制解调器标准;通过对目前IP传真研究现状的分析和总结,针对具体项目的需求提出了在SIPSYS蓝蜻蜓IAD-08O语音网关上用纯软件的方法实现存储转发传真功能;设计了传真Modem的体系结构以及各个功能模块的组成,给出了传真Modem的C语言具体实现,并针对SIPSYS蓝蜻蜓IAD-08O语音网关的软硬件平台结构对软件传真Modem进行了优化。最后给出了原型系统的测试结果。从测试结果来看,该系统性能稳定,各项性能指标都达到或超过了预期目标。目前SIPSYS蓝蜻蜓IAD-08O语音网关已经进行小批量生产,并且在实际应用中效果良好。更多还原

【Abstract】 With the VoIP(Voice Over Internet Protocol) service gradually familiar to consumers, IP voice gateway, as the important part of IP phone system, already has an larger size of markets and applications. As the traditional means of transmission of still images, Fax communications, because of its legal effect, user habits and convenience, is still a basic business in PSTN. Therefore, IP voice gateway integrated fax functionality has become an urgent demand.With the project of SIPSYS Blue Dragonfly IAD-08O Voice Gateway being the research background, this paper briefly introduces the classification of fax machines and the development of fax communications, studies the basic principles of communications of G3 fax machines and the related ITU-T T.4, T.30 protocol, source coding, channel coding as well as the V series modem standards; through the study and analysis of the current status of IP fax and the project-specific requirements, puts forward the pure software solution to achieve store and forward fax functions in the SIPSYS Blue Dragonfly IAD-08O voice gateway; designs a fax modem architecture and the composition of the various functional blocks, gives a fax modem concrete realization of the C language, and for the SIPSYS Blue Dragonfly IAD-08O voice gateway hardware and software platform architecture, Fax modem software has been optimized. Finally, gives the prototype system test results. From the test results, the system performance is stable, and various performance indicators have met or exceeded target.Present SIPSYS Blue Dragonfly IAD-08O Voice Gateway has been carrying out small-volume production, and has a good results in practical application.更多还原