And probably you can add a Warning header with warning response code 399 and proper text "Event mismatch" or whatever you feel is right.
Kamal Cisco, Bangalore India -----Original Message----- From: sip-implementors-boun...@lists.cs.columbia.edu [mailto:sip-implementors-boun...@lists.cs.columbia.edu] On Behalf Of Pandurangan R S Sent: Friday, May 29, 2009 11:13 AM To: hanifa.mohammed Cc: sip-implementors@lists.cs.columbia.edu Subject: Re: [Sip-implementors] Subscription is done for 'presence'. ButNOTIFYrecd with event header 'reg' (or/and) 'presence'. Whaterr resp? 481 is the appropriate response for your scenario. 489 is intended to be sent by NOTIFIER when it does not understand Event header value. Regards Pandu On Fri, May 29, 2009 at 10:58 AM, hanifa.mohammed < hanifa.moham...@globaledgesoft.com> wrote: > Hi, > > Also refer Sec "3.3.4. Dialog creation and termination" of same RFC: > > If an initial SUBSCRIBE request is not sent on a pre-existing dialog, > the subscriber will wait for a response to the SUBSCRIBE request or a > matching NOTIFY. > > Responses are matched to such SUBSCRIBE requests if they contain the > same the same "Call-ID", the same "From" header "tag", and the same > "CSeq". Rules for the comparison of these headers are described in > SIP [1]. If a 200-class response matches such a SUBSCRIBE request, > it creates a new subscription and a new dialog (unless they have > already been created by a matching NOTIFY request; see below). > > NOTIFY requests are matched to such SUBSCRIBE requests if they > contain the same "Call-ID", a "To" header "tag" parameter which > matches the "From" header "tag" parameter of the SUBSCRIBE, and the > same "Event" header field. > > [mohammed] > This is right that the NOTIFY must be matched based on all the > above. > The question is that when there is no match, there are two possibilities > 1 - dialog id itself does not match. So, 481 is opt and the > server cleans the subscrition. > 2 - dialog id matches but Event header does not mtch. So, if > 489 is sent, the server will not clean the subscription but rather may > try to send a corrected NOTIFY/ or do some corrective action. > > Pl suggest. > > Best Regards, > Mohammed Hanifa > > > > _______________________________________________ > Sip-implementors mailing list > Sip-implementors@lists.cs.columbia.edu > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
