With the rapid development of softswitch network, it has been a long-standing problem to provide users behind the firewall with perfect multiple services. This paper introduces several tranversal technologies and schemes, then compares and analyzes them,%为了在软交换情况下给防火墙/NAT后的用户提供完善的多元化服务。文章参考了IETF关于软交换网络中会话业务穿透NAT技术的各种方案,介绍了目前可以使用的几种NAT穿透技术和方案,并对几种技术方案进行了对比和分析。最后就软交换网络应用中的NAT穿透方案给出了应用建议。
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