%% You should probably cite rfc4028 instead of this I-D.
@techreport{ietf-sip-session-timer-15,
    number =    {draft-ietf-sip-session-timer-15},
    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-sip-session-timer/15/},
    author =    {Jonathan Rosenberg and Steve Donovan},
    title =     {{Session Timers in the Session Initiation Protocol (SIP)}},
    pagetotal = 27,
    year =      2004,
    month =     aug,
    day =       11,
    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{]}},
}