针对这一棘手问题，最受青睐的一种解决方案是从目前的互联网通信协议“IPv4”转换到“IPv6”。IPv 6可以提供数万亿个网络通信地址，而IPv 4提供的地址大概只有40亿个，相比之下少得可怜。

The touted solution to the problem is a switch to a standard called IPv6 that allows trillions of Internet addresses, while the current IPv4 standard provides a meager four billion or so.

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针对会话发起协议（SIP）穿越网络地址转换（NAT）的问题，提出一种基于端口探测的解决方案。

To solve the problem of Session Initiation Protocol(SIP) traversing Network Address Translator(NAT), this paper describes a new method based on port detection.

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接着研究了NAT协议的原理，深入地分析了NAT协议在各种应用场景下地址转换处理流程；

Then with in-depth understanding of NAT principles, we analyse the process flow of network address translation in NAT protocol on various application scenarios.

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