Session Timers in the Session Initiation Protocol (SIP)
draft-holmberg-sipcore-rfc4028bis-00

Document Type Active Internet-Draft (sipcore WG)
Last updated 2018-12-20
Replaces draft-ietf-sipcore-sessiontimer-race
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SIPCORE Working Group                                        C. Holmberg
Internet-Draft                                                  Ericsson
Obsoletes: 4028 (if approved)                                 S. Donovan
Intended status: Standards Track                            J. Rosenberg
Expires: June 23, 2019                                     Cisco Systems
                                                       December 20, 2018

        Session Timers in the Session Initiation Protocol (SIP)
                draft-holmberg-sipcore-rfc4028bis-00.txt

Abstract

   This document defines an extension to the Session Initiation Protocol
   (SIP).  This extension allows for a periodic refresh of SIP sessions
   through a re-INVITE or UPDATE request.  The refresh allows both user
   agents and proxies to determine whether the SIP session is still
   active.  The extension defines two new header fields: Session-
   Expires, which conveys the lifetime of the session, and Min-SE, which
   conveys the minimum allowed value for the session timer.

Status of This Memo

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   This Internet-Draft will expire on June 23, 2019.

Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect

Holmberg, et al.          Expires June 23, 2019                 [Page 1]
Internet-Draft                Session Timer                December 2018

   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Overview of Operation . . . . . . . . . . . . . . . . . . . .   4
   5.  Session-Expires Header Field Definition . . . . . . . . . . .   6
   6.  Min-SE Header Field Definition  . . . . . . . . . . . . . . .   8
   7.  422 Response Code Definition  . . . . . . . . . . . . . . . .   8
   8.  UAC Behavior  . . . . . . . . . . . . . . . . . . . . . . . .   9
   9.  Generating an Initial Session Refresh Request . . . . . . . .   9
   10. Processing a 2xx Response . . . . . . . . . . . . . . . . . .   9
   11. Processing a 422 Response . . . . . . . . . . . . . . . . . .  11
   12. Generating Subsequent Session Refresh Requests  . . . . . . .  11
   13. Proxy Behavior  . . . . . . . . . . . . . . . . . . . . . . .  12
   14. Processing of Requests  . . . . . . . . . . . . . . . . . . .  13
   15. Processing of Responses . . . . . . . . . . . . . . . . . . .  14
   16. Session Expiration  . . . . . . . . . . . . . . . . . . . . .  15
   17. UAS Behavior  . . . . . . . . . . . . . . . . . . . . . . . .  15
   18. Performing Refreshes  . . . . . . . . . . . . . . . . . . . .  17
   19. Security Considerations . . . . . . . . . . . . . . . . . . .  18
   20. Inside Attacks  . . . . . . . . . . . . . . . . . . . . . . .  18
   21. Outside Attacks . . . . . . . . . . . . . . . . . . . . . . .  19
   22. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  19
   23. IANA Registration of Min-SE and Session-Expires Header Fields  19
   24. IANA Registration of the 422 (Session Interval Too Small)
       Response Code . . . . . . . . . . . . . . . . . . . . . . . .  20
   25. IANA Registration of the 'timer' Option Tag . . . . . . . . .  20
   26. Example Call Flow . . . . . . . . . . . . . . . . . . . . . .  20
   27. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  25
   28. References  . . . . . . . . . . . . . . . . . . . . . . . . .  25
     28.1.  Normative References . . . . . . . . . . . . . . . . . .  25
     28.2.  Informative References . . . . . . . . . . . . . . . . .  25
   Appendix A. . . . . . . . . . . . . . . . . . . . . . . . . . . .  26
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  26
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