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GRUU again for the last time really

GRUU again for the last time really. Jonathan Rosenberg Cisco. Changes from -11. Minor Changes Removed references to provisional responses for non-INVITES Added note from Dales draft about not mucking with Contacts with ;gruu

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GRUU again for the last time really

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  1. GRUUagainfor the last timereally Jonathan Rosenberg Cisco

  2. Changes from -11 • Minor Changes • Removed references to provisional responses for non-INVITES • Added note from Dales draft about not mucking with Contacts with ;gruu • Added note from Dale’s draft about treating GRUU opaquely and not modifying URI parameters • Updated appendix to use EKRs stateless tokens draft

  3. Main Change: The Register Race REG Registrar Changes Expiration to 5s 200 OK NOTIFY reg-info 200 OK expiration REG new reg 200 OK NOTIFY reg-info Registrar sends a singleconsolidated state updatefor the result of the previoustwo events since they cameclose together So did My registerbeat the clock?? 200 OK

  4. General Problem • IF the registrar is going to muck with registrations, we need a reliable way for client to synchronize its temp-gruu with server at any time • Determine whether its set of valid temp-gruu match the servers

  5. Solution in GRUU-12 • If server modifies expiration times, MUST implement reg-event and gruu extension • Client that implements reg-event and GRUU MUST support gruu-reg-event • Reg-event notifications contain CSeq of first contact registered to that gruu with a given call-id • Client keeps all temp-gruu learned in REGISTER responses whose • Call-ID matches that of reg-event • CSeq is higher than that of reg-event

  6. Side Effect • Changing Call-ID in REGISTER refresh will • Expire all previous temp-gruu • Not cause any outage in registration – just a refresh – low overhead • Provides a crude bulk invalidation technique

  7. Consequences • If an instance fails and recovers and registers with a new Call-ID and same instance-ID • All temp-gruu are invalidated • Stateless token generation needs to use Call-ID and original CSeq instead of wallclock time

  8. Other ML Issues • Jeroen: temp GRUUs can be long • Will note this • Ekr-1: Is Supported or +sip.instance the trigger for GRUU generation? • As it is currently - +sip.instance. • Ekr-2: inclusion of pub-gruu and temp-gruu in REGISTER MUST NOT or SHOULD NOT? • Current SHOULD NOT is fine

  9. Other ML Issues • Ekr-3: Should a rebooting UA remove a stale contact? • No, as it is now • Ekr-4: Separators needed in string for cookie? • Yes – will add • Jeroen-1: only do GRUU processing for non-expiring contacts • Yes – will add • Jeroen-4: What if there are multiple contacts with same instance and no reg-id (GRUU but not sip-outbound) • Need to update – use outbound-like behavior to take most recent contact

  10. Next Steps • I have incorporated all comments into a working -13 • Once blackout period ends, -13 can be submitted and go to IESG

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