On 7/13/08 11:49 AM, Hadriel Kaplan wrote:
This implies I'm trying to hide/tunnel the information from
intermediaries to get around their policies. I'm not.
SBC's (and others) modify the From/To URI for a bunch of reasons. One
of those reasons is relationship hiding, and for any such policy there
is clearly no point in trying to avoid/bypass it, as they'll just go
delete or modify any new headers as you point out. There is nothing we
can do for such cases, imho.
At least, once they notice them, they'll delete or modify them. Until
then, the identity stuff will quite possibly get through them just fine
(potentially in violation of intended policy). But that's neither here
nor there, really; because, as you point out, the real issue is:
But for a lot of cases they're not modifying To/From for that reason - they're modifying
it to either "fix" them for specific interop reasons, or to hide topology (ie,
when it contains IP Addresses or hostnames). Those are the cases I'm trying to get the
information through.
And they're doing this because some products have unilaterally taken the
intended meaning of "To" and "From" and (intentionally or not)
misinterpreted them.
Now, let's imagine a world in which we take on
draft-kaplan-sip-asserter-identity as a working group item, and publish
it as an RFC. Over then following several years, it sees a relatively
high level of deployment. Are we to imagine that "P-Original-To" won't
be hijacked by the same kinds of systems that currently hijack "To" to
mean something other than it should? Sorry, I can't suspend my disbelief
that far.
All you're doing is taking the next step in a losing battle -- even if
the opponent is blithely unaware of the damage they are wreaking, it's
still a battle and we're still going to lose.
/a
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