On Tue, 2009-03-17 at 16:29 +0100, javier.ferreirogar...@telefonica.es wrote: > The current approach, when changing operational mode on the fly, is to > unsubscribe prior to automatic deregistration, then perform initial > registration of the new "feature tag" and perform initial subscription to > all event-packages. The overhead in terms of SIP messages is significant, > so we are wondering if it is possible to reuse "old" subscriptions. When > unregistering old contact and registering the new; the IP address in the > Contact keeps the same, the only item that changes is the feature tag. > Is this allowed according to RFC 3261?
I assume you mean "registrations" instead of "subscriptions". Certainly, the sequence of REGISTER requests that you propose is *allowed* by RFC 3261. And since the actual contact URI (as opposed to the field-parameter attached to it) does not change, the routing of requests for that AOR would not change -- the outgoing request-URI would still be <sip:10.232.110.202>. So I don't see why this case is interesting. I suspect you have not made clear what you think the trouble would be. Dale _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
