Re: 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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