{"draft":"draft-ietf-sip-session-timer-15","doc_id":"RFC4028","title":"Session Timers in the Session Initiation Protocol (SIP)","authors":["S. Donovan","J. Rosenberg"],"format":["ASCII","HTML"],"page_count":"27","pub_status":"PROPOSED STANDARD","status":"PROPOSED STANDARD","source":"Session Initiation Protocol","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.  [STANDARDS-TRACK]","pub_date":"March 2005","keywords":["[--------|p]","re-invite request","update request","session-expires","min-se"],"obsoletes":[],"obsoleted_by":[],"updates":[],"updated_by":[],"see_also":[],"doi":"10.17487\/RFC4028","errata_url":"https:\/\/www.rfc-editor.org\/errata\/rfc4028"}