< draft-ietf-sipcore-rfc4028bis-00.txt   draft-ietf-sipcore-rfc4028bis-01.txt >
SIPCORE Working Group C. Holmberg SIPCORE Working Group C. Holmberg
Internet-Draft Ericsson Internet-Draft Ericsson
Obsoletes: 4028 (if approved) S. Donovan Obsoletes: 4028 (if approved) S. Donovan
Intended status: Standards Track J. Rosenberg Intended status: Standards Track J. Rosenberg
Expires: June 24, 2019 Cisco Systems Expires: December 26, 2019 Cisco Systems
December 21, 2018 June 24, 2019
Session Timers in the Session Initiation Protocol (SIP) Session Timers in the Session Initiation Protocol (SIP)
draft-ietf-sipcore-rfc4028bis-00 draft-ietf-sipcore-rfc4028bis-01
Abstract Abstract
This document defines an extension to the Session Initiation Protocol This document defines an extension to the Session Initiation Protocol
(SIP). This extension allows for a periodic refresh of SIP sessions (SIP). This extension allows for a periodic refresh of SIP sessions
through a re-INVITE or UPDATE request. The refresh allows both user through a re-INVITE or UPDATE request. The refresh allows both user
agents and proxies to determine whether the SIP session is still agents and proxies to determine whether the SIP session is still
active. The extension defines two new header fields: Session- active. The extension defines two new header fields: Session-
Expires, which conveys the lifetime of the session, and Min-SE, which Expires, which conveys the lifetime of the session, and Min-SE, which
conveys the minimum allowed value for the session timer. conveys the minimum allowed value for the session timer.
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