Perhaps the interpretation should be that there is a contact per dialog
usage?
No, no, no. 3261 is very clear that the target belongs to the dialog, not
the dialog usage. There is no way that having separate ones could work.
Well... 3261 is also very clear on that BYE terminates the dialog, and yet
some people argue that it should only terminate a single usage...
It's just that the notion of a "dialog usage" is not very well defined in
rfc3261
I'm not saying that Contact per usage is necessarily a good idea, just
trying to see if there are any use cases for it. For example, what you could
do is specify a different transport for NOTIFYs (TCP) while still using UDP
for session refresh, etc.
Jeroen
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