| 实现非对称型NAT穿越的VoIP系统设计方案 |
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| 引用本文： | 孙昆,孙斌,赵振民.实现非对称型NAT穿越的VoIP系统设计方案[J].计算机应用,2009,29(Z1). |
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| 作者姓名： | 孙昆 孙斌 赵振民 |
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| 作者单位： | 1. 北京邮电大学,计算机科学与技术学院,北京,100876
2. 北京邮电大学,信息与通信工程学院,北京,100876 |
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| 摘 要： | 基于SIP的VoIP系统在Internet上已经取得广泛应用,但在企业网环境中,由于大量NAT设备的存在,端到端的SIP呼叫难以实现。分析了四类NAT的映射规则及其对SIP消息造成的影响,介绍了现有的NAT穿越方法,最后在STUN方式基础上提出了一种实现非对称型NAT穿越的VoIP系统设计方案。该方案在用户认证服务器和VoIP软终端上各开设一个端口侦听穿越请求,并对收到的包进行相应处理。经过校园网到企业网环境的测试证明该方案能达到很好的接通率。
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| 关 键 词： | 网络地址转换 会话初始化协议 STUN |
VoIP system design for non-symmetric NAT traversal |
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| SUN Kun,SUN Bin,ZHAO Zhen-min.VoIP system design for non-symmetric NAT traversal[J].journal of Computer Applications,2009,29(Z1). |
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| Authors: | SUN Kun SUN Bin ZHAO Zhen-min |
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| Affiliation: | 1.School of Computer Science and Technology;Beijing University of Posts and Telecommunications;Beijing 100876;China;2.School of Information and Telecommunication Engineering;China |
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| Abstract: | Session Initailization Protocol(SIP)-based VoIP systems have been broadly applied over Internet.However,as the board use of Network Address Translation(NAT) facilities,end-to-end SIP call becomes hard to realize in Intranet.This paper introduced the mapping rules of four types of NAT;then it analyzed NAT's influence on SIP messages.After introducing the existing traversal methods,the author proposed a VoIP system design with the function of non-symmetric NAT traversal.This solution opened one UDP port on us... |
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| Keywords: | Network Address Translation(NAT) Session Initialization Protocol(SIP) STUN |
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