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List:       sip-implementors
Subject:    Re: [Sip-implementors] Proxying NOTIFY
From:       Robert Sparks <rsparks () dynamicsoft ! com>
Date:       2003-05-21 19:03:59
Message-ID: 1053543839.926.147.camel () RjS ! localdomain
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If the UA has no matching subscription it will return 481.
If the UA is dead, the transaction will time-out.

NOTIFY occurs inside a dialog established by SUBSCRIBE. That
dialog will have an established route set. You won't fork a
NOTIFY.

If your question is about forking non-invite requests in general, then
look at the proxy section in 3261: You could end up waiting for
_all_ branches to give you an answer, time-out, or report a transport
failure before sending any final response upstream (the exception 
is the immediate forwarding of the first 2xx class response).

RjS

On Wed, 2003-05-21 at 10:25, M. Ranganathan wrote:
> Arjun
> 
> Thanks. Indeed I had read that but then I started to think what would 
> happen if the UA that is supposed to field the NOTIFY has no 
> subscription or is dead. Then it will never respond OK. Further what if 
> I have to send several NOTIFYs  (ie. forked). Then should I wait till 
> the first OK comes back before responding to the original  NOTIFY.
> 
> Regards
> 
> Ranga
> 
> Arjun Roychowdhury wrote:
> 
> >Ranga,
> >if you are indeed referring to a Proxy, that it should simply proxy the 
> >NOTIFY across to the next hop.
> >
> ><quote RFC 3265>
> >3.2.3. Proxy NOTIFY Behavior
> >   Proxies need no additional behavior beyond that described in SIP [1]
> >   to support NOTIFY.  If a proxy wishes to see all of the SUBSCRIBE and
> >   NOTIFY requests for a given dialog, it MUST record-route the initial
> >   SUBSCRIBE and any dialog-establishing NOTIFY requests.  Such proxies
> >   SHOULD also record-route all other SUBSCRIBE and NOTIFY requests.
> ></quote>
> >
> >--
> >Arjun Roychowdhury @ Hughes Software Systems
> >11717 Exploration Lane, Germantown MD 20876
> >(O): 301 212 7860 
> >
> >
> >
> >
> >"M. Ranganathan" <mranga@nist.gov>
> >Sent by: sip-implementors-bounces@cs.columbia.edu
> >05/21/2003 11:10 AM
> >
> > 
> >        To:     sip-implementors@cs.columbia.edu
> >        cc: 
> >        Subject:        [Sip-implementors] Proxying NOTIFY
> >
> >
> >Hello!
> >
> >I have a question about handling NOTIFY in a proxy. Should the proxy 
> >immediately respond OK to the notify before forwarding or only when the 
> >other end (ie. the subscriber if any answers OK). I suspet that 
> >immediate OK is the right thing to do  but I am not certain.
> >
> >Thanks
> >
> >Ranga.
> >
> >  
> >

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