%% You should probably cite draft-ietf-sip-body-handling instead of this I-D.
@techreport{camarillo-sip-body-handling-01,
    number =    {draft-camarillo-sip-body-handling-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-camarillo-sip-body-handling/01/},
    author =    {Gonzalo Camarillo},
    title =     {{Message Body Handling in the Session Initiation Protocol (SIP)}},
    pagetotal = 12,
    year =      2007,
    month =     may,
    day =       29,
    abstract =  {This document clarifies how message bodies are handled in SIP. Additionally, it discusses to which degree SIP user agents need to support MIME (Multipurpose Internet Mail Extensions)-encoding of body parts.},
}