US 大型服务商wifi calling 所需的port和 domain(ePDG)

Wifi Calling 一般是通过IPSEC tunnels

Port 这个很简单,就是在UDP下需要打开如下端口:

UDP – port 500 (IPsec – IKE)
UDP – port 4500 (IPsec – NAT traversal)


ePDG: Evolved Packet Data Gateway

ePDG其实就是一个FQDN, 很多服务商都发布了他们的ePDG. 国内一般用的比较多的是t-mobile 的wifi calling. 所以可以多关注一个t-mobile 的 ePDG




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