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Midbox traversal–offer in INV
Alice
atlanta.com
biloxi.com
Bob
Alice can try to get STUN/TURN addresses
If address in offer are not valid, atlanta sends 4xx proposing new addresses; if they are valid, open pinholes/create bindings
Bob can try STUN to fetch addresses
biloxi adds proposed answer for Bob, and forwards
Bob responds with an answer for Alice, and (in NAT case) can include Bob’s actual addresses
PPT Version