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by st3fan 5560 days ago
STUN and TURN were already mentioned.

There is also Apple's own NAT-PMP which is more like UPnP but simpler. It can directly ask your (Apple) router to open a port and redirect it incoming traffic to a specific IP address on your local network.

https://secure.wikimedia.org/wikipedia/en/wiki/NAT_Port_Mapp...

I bet Apple also supports UPnP these days.