Re: francois' comments and why RFC4474 not used in the field

Dean Willis <[email protected]>
Newsgroups gmane.ietf.sip
Message-ID <[email protected]>
On Apr 2, 2009, at 8:28 AM, Hadriel Kaplan wrote:

>
> p.s. and not all transits do change SDP, and some only change SDP in  
> certain circumstances (like for transcoding).
>

Well we certainly can't expect transcoding to be compatible with e2e  
crypto.

So are there any legitimate use cases for requiring that the protocol  
supports MITM rewriting of SDP?

Having a transit provider that, for unknown reasons changes SDP is  
still not an adequate justification.

Perhaps is lots of calls started failing because they endpoints detect  
that a MITM attack on their signaling/media has occurred, and did so  
in a way that makes that failure evident to the MITM, then we'd see  
fewer MITMs making that mistake.

--
Dean
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