%% You should probably cite draft-ietf-sipcore-rfc4028bis-06 instead of this revision. @techreport{ietf-sipcore-rfc4028bis-00, number = {draft-ietf-sipcore-rfc4028bis-00}, type = {Internet-Draft}, institution = {Internet Engineering Task Force}, publisher = {Internet Engineering Task Force}, note = {Work in Progress}, url = {https://datatracker.ietf.org/doc/draft-ietf-sipcore-rfc4028bis/00/}, author = {Christer Holmberg and Steve Donovan and Jonathan Rosenberg}, title = {{Session Timers in the Session Initiation Protocol (SIP)}}, pagetotal = 26, year = 2018, month = dec, day = 21, 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.}, }