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

 
> But if some service provider in the middle needs to drop the 
> call to <some spiffy codec> which isn't supported by Alice's 
> SP nor by Bob's SP -- what would that service provider do?  
> Not deploy that spiffy new codec, even though it would save 
> them thousands of dollars a day in satellite bandwidth fees?

Well, no. You just can't do end-to-end media security in this
case.

I don't understdand at all the claim that if transcoding is 
allowed, there would be any point in doing media security, or
even Secure identity for that matter. I'm just saying if transcoding
or media mucking-around is allowed, then just stick with P-AI.
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