Session Timers in the Session Initiation Protocol (SIP)
draft-ietf-sipcore-rfc4028bis-01

Document Type Active Internet-Draft (sipcore WG)
Last updated 2019-06-24
Replaces draft-holmberg-sipcore-rfc4028bis
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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: December 26, 2019                                 Cisco Systems
                                                           June 24, 2019

        Session Timers in the Session Initiation Protocol (SIP)
                    draft-ietf-sipcore-rfc4028bis-01

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 December 26, 2019.

Copyright Notice

   Copyright (c) 2019 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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   carefully, as they describe your rights and restrictions with respect

Holmberg, et al.        Expires December 26, 2019               [Page 1]
Internet-Draft                Session Timer                    June 2019

   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
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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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