基于ALG的VoIP中NAT穿越技术的研究与实现

doi:10.3969/j.issn.1006-2475.2011.03.026

计算机与现代化 ›› 2011, Vol. 1 ›› Issue (3): 95-97.doi: 10.3969/j.issn.1006-2475.2011.03.026

基于ALG的VoIP中NAT穿越技术的研究与实现

赵慧¹，楼新远¹，杨庆伟²

1.西南交通大学信息科学与技术学院，四川成都 610031；2.电子科技大学计算机科学与工程学院，四川成都 611731

收稿日期:2010-10-28 修回日期:1900-01-01 出版日期:2011-03-18 发布日期:2011-03-18

Research and Realization of NAT Traversal Solutions in VoIP System Based on ALG

ZHAO Hui¹, LOU Xin-yuan¹, YANG Qing-wei²

1. School of Information Science and Technology, Southwest Jiaotong University, Chengdu 610031, China;2. School of Computer Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China

Received:2010-10-28 Revised:1900-01-01 Online:2011-03-18 Published:2011-03-18

摘要/Abstract

摘要： 在VoIP（Voice over Internet Protocol）通信中H.323协议消息携带的地址信息在穿越NAT（Network Address Translation）时，传统的ALG（Apply Layer Gateway）方案采用的全部解码方法，性能较低。为了解决此问题，本文分析ALG技术，采用按需解码的方法，只解码消息的地址信息部分，不需全部重新编码，并做对比实验。结果表明，按需解码所需时间约是全部解码方案所需时间的1/75~1/80，优化了ALG的处理性能。

关键词: ALG, 按需解码, NAT穿越, H.323

Abstract: During the VoIP communication, the address information carried by H.323 protocol traveling the NAT, decoding-all method with lower performance is used in the traditional performance of ALG solution. To optimize performance, the paper analyzes the ALG technology and gives a decoding method using on-demand which only decodes the address information of the message instead of re-encoding all. A comparison experiment is carried out which shows that the time of decoding on-demand is about 1/75~1/80 of the decoding-all solution. The problem of low efficiency of ALG treatment is optimized.

Key words: ALG, on-demand decoding, NAT traversal, H.323

中图分类号:

TP393

赵慧;楼新远;杨庆伟. 基于ALG的VoIP中NAT穿越技术的研究与实现[J]. 计算机与现代化, 2011, 1(3): 95-97.

ZHAO Hui;LOU Xin-yuan;YANG Qing-wei. Research and Realization of NAT Traversal Solutions in VoIP System Based on ALG[J]. Computer and Modernization, 2011, 1(3): 95-97.

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基于ALG的VoIP中NAT穿越技术的研究与实现

Research and Realization of NAT Traversal Solutions in VoIP System Based on ALG

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