Subject: RE: [Sipping] SIP Status code for communicating about UA inminimal state- Post active dialog

From: "Michael Hammer \(mhammer\)" <[email-masked]>
Date: Wed, 12 Apr 2006 10:01:25 -0400

This sounds like you want B2BUA1 to be able to "subscribe" to some state
on B2BUA2, and receive notifications of such state changes.  Perhaps
some sort of XML body could be defined to send that information.

Mike

> -----Original Message-----
> From: Dale R. Worley [mailto:[email-masked]] 
> Sent: Wednesday, April 12, 2006 9:52 AM
> To: Sipping
> Subject: Re: [Sipping] SIP Status code for communicating 
> about UA inminimal state- Post active dialog
> 
> On Wed, 2006-04-12 at 12:13 +0530, Rajeev Narang (ranarang) wrote:
> > The requirement is that we want to communicate to B2BUA1 about this 
> > recent situation with B2BUA2 in response to the session refresh. The
> > B2BUA1 must be allowed to take some specific action based 
> on the state 
> > of the B2BUA2. Also Proxy server between the UA's mustn't tear down 
> > the call.
> >  
> > Basically the response code should be such that the session refresh 
> > procedure must go "on" but remote (refresher) must come to 
> know about 
> > this situation.
> 
> The difficulty is that you want to communicate "this dialog 
> is continuing, but not really".  This seems to be 
> sufficiently specialized for your application that it is 
> unlikely to be standardized.  I would suggest designing an 
> "out of band" communication channel between B2BUA1 and 
> B2BUA2.  You could use INFO messages, or even your own 
> method, to implement this, or define some private headers you 
> can piggyback on the ordinary SIP transactions.
> 
> Dale
> 
> 
> 
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