Session Timers in the Session Initiation Protocol (SIP)

The information below is for an old version of the document
Document Type Expired Internet-Draft (sipcore WG)
Authors Christer Holmberg  , Steve Donovan  , Jonathan Rosenberg 
Last updated 2020-06-29 (latest revision 2019-12-27)
Replaces draft-holmberg-sipcore-rfc4028bis
Stream Internet Engineering Task Force (IETF)
Expired & archived
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Stream WG state WG Document
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IESG IESG state Expired
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


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.


Christer Holmberg (
Steve Donovan (
Jonathan Rosenberg (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)