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ICE with Policy Authorization, Slide 2

Alice


Bob

FW-B

FW-A
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SIP 183 or 200 From: Bob To: Alice IP=Z, UDP=z, Token=B1
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STUN Response
Bob's Call Controller
Alice's Call Controller
No external authorization check is necessary because the same STUN transaction-id and (flipped) 5-tuple are in STUN Request and Response
PPT Version