@techreport{schulzrinne-sip-reason-01,
    number =    {draft-schulzrinne-sip-reason-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-schulzrinne-sip-reason/01/},
    author =    {Henning Schulzrinne and David R. Oran and Gonzalo Camarillo},
    title =     {{The Reason Header Field for the Session Initiation Protocol}},
    pagetotal = 7,
    year =      2002,
    month =     mar,
    day =       4,
    abstract =  {For creating services, it is often useful to know why a SIP request was issued. This document defines an optional informational header field, Reason, that provides this information.},
}