Session Timers in the Session Initiation Protocol (SIP)

Document Type Replaced Internet-Draft (sipcore WG)
Authors Christer Holmberg  , Steve Donovan  , Jonathan Rosenberg 
Last updated 2018-12-20
Replaces draft-ietf-sipcore-sessiontimer-race
Replaced by draft-ietf-sipcore-rfc4028bis
Stream IETF
Intended RFC status (None)
Expired & archived
pdf htmlized (tools) htmlized bibtex
Stream WG state Candidate for WG Adoption
Document shepherd No shepherd assigned
IESG IESG state Replaced by draft-ietf-sipcore-rfc4028bis
Consensus Boilerplate Unknown
Telechat date
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active.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.)