%% You should probably cite rfc8866 instead of this I-D.
@techreport{ietf-mmusic-rfc4566bis-04,
    number =    {draft-ietf-mmusic-rfc4566bis-04},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-ietf-mmusic-rfc4566bis/04/},
    author =    {Mark J. Handley and Van Jacobson and Colin Perkins and Ali C. Begen},
    title =     {{SDP: Session Description Protocol}},
    pagetotal = 49,
    year =      ,
    month =     ,
    day =       ,
    abstract =  {This memo defines the Session Description Protocol (SDP). SDP is intended for describing multimedia sessions for the purposes of session announcement, session invitation, and other forms of multimedia session initiation.},
}