Unsolicited NOTIFYs are widely used for Voicemail and are allowed in RFC3265 Please refer to the following section....
3.2. Description of NOTIFY Behavior NOTIFY messages are sent to inform subscribers of changes in state to which the subscriber has a subscription. Subscriptions are typically put in place using the SUBSCRIBE method; however, it is possible that other means have been used. If any non-SUBSCRIBE mechanisms are defined to create subscriptions, it is the responsibility of the parties defining those mechanisms to ensure that correlation of a NOTIFY message to the corresponding subscription is possible. Designers of such mechanisms are also warned to make a distinction between sending a NOTIFY message to a subscriber who is aware of the subscription, and sending a NOTIFY message to an unsuspecting node. The latter behavior is invalid, and MUST receive a "481 Subscription does not exist" response (unless some other 400- or 500-class error code is more applicable), as described in section 3.2.4. In other words, knowledge of a subscription must exist in both the subscriber and the notifier to be valid, even if installed via a non-SUBSCRIBE mechanism. A NOTIFY does not terminate its corresponding subscription; in other words, a single SUBSCRIBE request may trigger several NOTIFY requests. "The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man." -- George Bernard Shaw -----Original Message----- From: Brian Stucker [mailto:[EMAIL PROTECTED] Sent: Monday, October 22, 2007 4:24 AM To: Dean Willis; Christer Holmberg Cc: sip; Adam Roach; Paul Kyzivat; Michael Procter; Elwell,John Subject: RE: [Sip] INFO Let me send you my "Twinkle, twinkle, MWI" script. A few hours of having the right people's phones blinking like they're possessed will fix that. If not, you can still use it to create the most complicated set of Christmas tree lights ever assembled. Regards, Brian > -----Original Message----- > From: Dean Willis [mailto:[EMAIL PROTECTED] > Sent: Sunday, October 21, 2007 7:38 PM > To: Christer Holmberg > Cc: Paul Kyzivat; sip; Elwell, John; Michael Procter; Adam Roach; > Stucker, Brian (RICH1:AR00) > Subject: Re: [Sip] INFO > > > On Oct 20, 2007, at 1:08 AM, Christer Holmberg wrote: > > > Hi Paul, > > > > I am talking about a proxy. > > > > So, you are saying that the proxy would always forward the NOTIFY, > > even if it does not have any state of a subscription dialog, or > > subscription usage within a dialog? > > > > Many proxies blindly forward NOTIFY. I know this because certain very > popular phone adapters with blue boxes use unsolicited NOTIFY for > their message waiting indicators, and many operators seem to have > deployed them with some success, despite much gnashing of teeth on my > part. > > -- > Dean > _______________________________________________ Sip mailing list https://www1.ietf.org/mailman/listinfo/sip This list is for NEW development of the core SIP Protocol Use [EMAIL PROTECTED] for questions on current sip Use [EMAIL PROTECTED] for new developments on the application of sip _______________________________________________ Sip mailing list https://www1.ietf.org/mailman/listinfo/sip This list is for NEW development of the core SIP Protocol Use [EMAIL PROTECTED] for questions on current sip Use [EMAIL PROTECTED] for new developments on the application of sip
