> The problem you are describing appears to be 
> related to - but not the same as - HERFP.

I agree.  Unless a solution is desired before HERFP, 
there isn't much reason for them to progress separately.


> I am not aware of any draft that addresses this. 

It is presented within Figure 10 of Jonathan's HERFP solution.

http://www.jdrosen.net/papers/draft-rosenberg-sip-unify-00.txt


> My first thought is that the UA should be conservative in 
> presenting responses to the user, it could show "progress" 
> but not popup a message saying "person X is answering...", 
> to avoid getting the user's hopes up too high too early

I was mainly referring to interactions associated with 
forking and early media.  However I see reason in preventing
the caller from acting upon the various early dialogs.

A -- P -- X
       -- Y

X returns 183 with SDP.  Y returns 180 without SDP.  
The X leg is terminated by P or X.  It would be beneficial 
if P could easily communicate this to A.


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