@misc{rfc4028,
    series =    {Request for Comments},
    number =    4028,
    howpublished =  {RFC 4028},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC4028},
    url =       {https://www.rfc-editor.org/info/rfc4028},
    author =    {Jonathan Rosenberg and Steve Donovan},
    title =     {{Session Timers in the Session Initiation Protocol (SIP)}},
    pagetotal = 27,
    year =      2005,
    month =     may,
    abstract =  {This document defines an extension to the Session Initiation Protocol (SIP). This extension allows for a periodic refresh of SIP sessions through a \textbackslash{}\%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: \textbackslash{}\%Session-Expires, which conveys the lifetime of the session, and \textbackslash{}\%Min-SE, which conveys the minimum allowed value for the session timer. {[}STANDARDS-TRACK{]}},
}