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Contact Correlation Problem How does Alice know that Not really a problem in a triangle topology. Slightly problematic in a trapezoid if either user is roaming. (Alice is using what appears to be a hotel lobby wireless network with a mandatory SIP proxy. No way to automatically judge trust of this proxy) Obvious solution is request history. Proxies that retarget, provided signed “cookie trail” to the eventual Contact. Works with proposal to add/repack bodies |