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目前广泛部署的NAT使得SIP穿越NAT变得越来越困难。本文提出了运用GRE隧道技术解决SIP穿越NAT的方案。通过在私网内架设GRE客户端和在防火墙/NAT之外(公网)架设GRE服务器,所有SIP信息及媒体流都通过GRE客户端和服务器端进行转发,从而避免了因为NAT的存在,导致SIP信息流无法穿越防火墙/NAT的问题。
The widespread deployment of NAT makes it increasingly difficult for SIP to traverse NAT. This paper proposes a solution to the SIP traversal NAT using GRE tunnel technology. By setting up a GRE client in the private network and setting up a GRE server outside the firewall / NAT (public network), all SIP information and media streams are forwarded through the GRE client and the server, so as to avoid the NAT SIP traffic can not traverse firewall / NAT issues.