@techreport{sparks-sip-sec-options-00,
    number =    {draft-sparks-sip-sec-options-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-sparks-sip-sec-options/00/},
    author =    {Robert Sparks},
    title =     {{Securing REFER - Options discussed at IETF53}},
    pagetotal = 13,
    year =      2002,
    month =     apr,
    day =       3,
    abstract =  {This memo documents and expands on the discussion on securing REFER at the IETF53 SIP meeting. It explores several possible solution mechanisms with rough discussion of the pros and cons of each. This memo proposes futher development of an S/MIME based solution.},
}