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

Cullen wrote:

> The thing I keep asking is can we make a list of reason why 
> SDP and headers get changes and in what scenarios they do 
> this. I think it will be hard to sort how to fix this without 
> being clear what needs to be fixed.
>  

Isn't that the function of the text that was placed in section 8 of

http://tools.ietf.org/html/draft-elwell-sip-e2e-identity-important-03

If it is not, then what do you think is missing.

regards

Keith

> -----Original Message-----
> From: [email protected] [mailto:[email protected]] On 
> Behalf Of Cullen Jennings
> Sent: Tuesday, March 31, 2009 11:32 PM
> To: Jiri Kuthan
> Cc: [email protected]; Francois Audet
> Subject: Re: [Sip] francois' comments and why RFC4474 not 
> used in the field
> 
> 
> On Mar 28, 2009, at 2:02 PM, Jiri Kuthan wrote:
> 
> >
> > I'm worried this is only a wishful thinking. While 
> perfectly logical, 
> > still even in such constrained setups some bizzar ALGs do in my 
> > experience appear in the middle, change SDP and make thus 
> the identity 
> > worthless.
> 
> The thing I keep asking is can we make a list of reason why 
> SDP and headers get changes and in what scenarios they do 
> this. I think it will be hard to sort how to fix this without 
> being clear what needs to be fixed.
> 
> For example, one of the things we might want to say is 
> something like:  
> the Phone is behind a NAT and connects to it's proxy / 
> registrar for its' domain. That proxy/b2bua whatever mucks 
> with IP/ports in the SDP for NAT traversal. Then we could ask 
> if 4474 is broken in this case or not and what might be a 
> good way of solving the problem of having UAs behind NATs.
> 
> Cullen <in my individual contributor role>
> 
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