Elwell, John wrote:
> Paul,
> 
> The problem is, what incentive does the SBC vendor have to go to these
> lengths? I really think we need a solution that doesn't require the SBC
> to do any more than pass information on transparently. RFC 4474 fits
> this criterion, except that it won't work when SBCs do media steering or
> make other "harmless" changes to signed information.
>

The problem is that if the SBC has the power to arbitrarily rewrite the
contents of the message, then  it is potentially doing much more than
just "pass information on transparently". If it was transparent, it
would be a proxy, not an SBC!

The "right" way to do what we seem to want here probably involves adding
a routing protocol layer to RTP. That, however, makes for a very
different architecture from what we have now.

--
Dean
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