[Sip] RFC 4474 and SBC traversal

["Elwell, John" <john.elwell at siemens.com>]

SBCs do exist, often for good reasons that Hadriel has expanded on
already. I firmly believe that DTLS-SRTP will not be deployable in a
meaningful way without addressing this problem. Concerning solutions, we
have drafts from Kai and Dan, or perhaps a merger of the two somehow
would work. It also depends to some extent whether we are talking only
about email-style URIs or about E.164-based URIs too.

John
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