%% You should probably cite rfc4411 instead of this I-D.
@techreport{ietf-sipping-reason-header-for-preemption-04,
    number =    {draft-ietf-sipping-reason-header-for-preemption-04},
    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-sipping-reason-header-for-preemption/04/},
    author =    {James Polk},
    title =     {{Extending the Session Initiation Protocol (SIP) Reason Header for Preemption Events}},
    pagetotal = 22,
    year =      2005,
    month =     sep,
    day =       12,
    abstract =  {This document proposes an IANA Registration extension to the Session Initiation Protocol (SIP) Reason Header to be included in a BYE Method Request as a result of a session preemption event, either at a user agent (UA), or somewhere in the network involving a reservation-based protocol such as the Resource ReSerVation Protocol (RSVP) or Next Steps in Signaling (NSIS). This document does not attempt to address routers failing in the packet path; instead, it addresses a deliberate tear down of a flow between UAs, and informs the terminated UA(s) with an indication of what occurred. {[}STANDARDS-TRACK{]}},
}