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Session Timers in the Session Initiation Protocol (SIP)

Document Type Expired Internet-Draft (sipcore WG)
Authors Christer Holmberg , Steve Donovan , Jonathan Rosenberg
Last updated 2022-07-31 (Latest revision 2022-01-27)
Replaces draft-holmberg-sipcore-rfc4028bis
Stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Expired & archived
Stream WG state WG Document
Document shepherd (None)
IESG IESG state Expired
Consensus boilerplate Unknown
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


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.)