@techreport{ono-earlier-comm-references-00,
    number =    {draft-ono-earlier-comm-references-00},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-ono-earlier-comm-references/00/},
    author =    {Kumiko Ono and Henning Schulzrinne},
    title =     {{Referencing Earlier Communications in SIP Requests}},
    pagetotal = 8,
    year =      2009,
    month =     oct,
    day =       12,
    abstract =  {This document defines a SIP header extension that refers to earlier SIP or non-SIP communication in SIP requests. For example, this extension allows users to correlate a SIP session with earlier sessions or email exchanges.},
}