@misc{rfc4411,
    series =    {Request for Comments},
    number =    4411,
    howpublished =  {RFC 4411},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC4411},
    url =       {https://www.rfc-editor.org/info/rfc4411},
    author =    {James Polk},
    title =     {{Extending the Session Initiation Protocol (SIP) Reason Header for Preemption Events}},
    pagetotal = 22,
    year =      2006,
    month =     feb,
    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{]}},
}