%% You should probably cite draft-ietf-mmusic-mux-exclusive instead of this I-D.
@techreport{holmberg-mmusic-mux-exclusive-03,
    number =    {draft-holmberg-mmusic-mux-exclusive-03},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-holmberg-mmusic-mux-exclusive/03/},
    author =    {Christer Holmberg},
    title =     {{Indicating Exclusive Support of RTP/RTCP Multiplexing using SDP}},
    pagetotal = 7,
    year =      2015,
    month =     dec,
    day =       15,
    abstract =  {This document defines how an endpoint can indicate exclusive support of RTP/RTCP multiplexing using the Session Description Protocol (SDP). The document updates RFC 5761, by defining how the SDP 'rtcp' attribute is used, together with the SDP 'rtcp-mux' attribute, to indicate exclusive support of RTP/RTCP multiplexing.},
}