| H.323协议跨越NAT网关的研究 |
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| 引用本文： | 侯锡柱,马跃,陈立南.H.323协议跨越NAT网关的研究[J].北京邮电大学学报,2005,28(2):91-94. |
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| 作者姓名： | 侯锡柱 马跃 陈立南 |
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| 作者单位： | 北京邮电大学,计算机科学与技术学院,北京,100876;北京邮电大学,计算机科学与技术学院,北京,100876;北京邮电大学,计算机科学与技术学院,北京,100876 |
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| 摘 要： | 对网络地址转换（NAT）及H.323呼叫过程进行了深入分析，H.323系列协议和应用依赖于端到端的网络，数据包不加修改地从源地址发送到目的地址。在NAT或防火墙的网络中，由于需要对协议的端口和地址进行转换或过滤，经过修改的地址与数据包载荷内容不符，导致H.323呼叫不能正常进行。采用应用层网关模型，对NAT进行应用层扩展，提出了在使用NAT网关情况下H.323的跨网关呼叫的几个有效解决办法。
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| 关 键 词： | 网络地址转换 H.323 IP电话 |
| 文章编号： | 1007-5321(2005)02-0091-04 |
| 修稿时间： | 2004年2月13日 |
Research of H.323 Protocol over NAT Gateway |
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| HOU Xi-zhu,MA Yue,CHEN Li-nan.Research of H.323 Protocol over NAT Gateway[J].Journal of Beijing University of Posts and Telecommunications,2005,28(2):91-94. |
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| Authors: | HOU Xi-zhu MA Yue CHEN Li-nan |
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| Affiliation: | Computer Science and Technology School, Beijing University of Posts and Telecommunications, Beijing 100876, China |
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| Abstract: | Some efficient solutions for making H.323 call through network address translation(NAT) gateway are proposed in this paper. The H.323 protocol packets are unmodified from the source to the destination in end-to-end network. However, the port and IP address of these packets will be modified when they pass through the NAT gateway. The modified packets address cannot match the calling address in the H.323 protocol packets. This will result the H.323 call abnormal. We present some efficient methods to solve this problem by extending the ALG (application layer gateway) model. |
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| Keywords: | H 323 |
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