说明：  详细介绍了ICE整个过程，NAT类型和如何穿越防火墙，并并且有自己系统的相关部分的流程图。，已通过测试。
(Description of the entire process of the ICE, the NAT types and how to traverse the firewall, and there are a flowchart of the relevant part of the own system. , Has been tested.)