On Mon, 2009-06-15 at 15:52 -0400, M. Ranganathan wrote:
> 
> Another question I have in my mind is :
> 
> If you have two systems behind NATs each with a domain name
> sixp.example.local ( perfectly legal ) and you want to federate them
> in the manner you are describing but without a B2BUA, will one system
> not ge confused by the From header of the other?

That one answers itself - the '.local' domain is _local_.  It's never
going to work to expect that to work _anywhere_ with _anything_ outside
it's scope.

> And another question I have is about request size but we can put that
> aside and assume for now that we can use a TCP connection between the
> two.

In theory, SIP should work with large requests over UDP, and sometimes
it does.  As you say, TCP is preferred in these cases.  


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