What is the role of the Session Traversal Utilities for NAT server provided by the...

It facilitates SD-WAN toners and controllers to discover their own mapped or translated IP addresses and port numbers

It prevents SD-WAN Edge routers from forming sessions with public transports among different service providers

It facilitates SD-WAN Edge routers to stay behind a NAT-enabled firewall while the transport addresses of the SD-WAN controller are unNAT-ed

It allows WAN Edge routers to form sessions among MPLS TLOCs using only public IP addresses