Goal two: net visits mutually through NAT, and through NAT, visit Internet, Filter specific website and specific webpage.
目标二：内网通过NAT相互访问，并通过NAT访问互联网，过滤特定网站和特定网页。
Well, how the correspondence software based on SIP pass through NAT is one important question in the SIP applied research.
因此在SIP通信中，如何使基于SIP的通信软件穿越NAT是SIP应用研究中的一个重要问题。
External malicious host can still through the NAT equipment and the public address using private address arrive the slogan "protected" host.
外部的恶意主机仍然可以通过NAT设备的公有地址和端口号到达使用私有地址的“受到保护”的主机。
Though TRUN can traverse symmetrical NAT, it causes network delay because packet needs to transmit through TRUN server.
TRUN虽然能够穿越对成型的NAT，但由于报文要通过TRUN服务器转发，这又增加了网络延迟。
Though TRUN can traverse symmetrical NAT, it causes network delay because packet needs to transmit through TRUN server.
TRUN虽然能够穿越对成型的NAT，但由于报文要通过TRUN服务器转发，这又增加了网络延迟。
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