On Wed, 2006-01-25 at 07:43 +0000, Matthew Gardiner wrote: > Furthermore, would I be right in saying that INVITE and SUBSCRIBE are the > only requests which are able to create dialogs?
Let me add my two cents: Some SIP systems create implicit subscriptions, usually when UAs register, they are given subscriptions to the MWI, etc. In a case like this, the NOTIFYs still should be inside dialogs, one for each subscription, and so the first NOTIFY of a subscription will establish the call-id/to-tag/from-tag. There is an internet-draft going around that codifies setting up implicit subscriptions, IIRC. Also, REGISTERs are done in sequences which look a lot like dialogs, in that they maintain a call-id/to-tag/from-tag and CSeq count, but they do not keep a route set. Or at least, they maintain a call-id; it seems from RFC 3261 that each REGISTER and response have to-tag and from-tag, but it's not clear whether they're expected to be the same between REGISTERs with the same call-id. Dale --- interop.pingtel.com -- the public SIP phone interoperability test server _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
