%% You should probably cite rfc6871 instead of this I-D.
@techreport{ietf-mmusic-sdp-media-capabilities-16,
    number =    {draft-ietf-mmusic-sdp-media-capabilities-16},
    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-sdp-media-capabilities/16/},
    author =    {Robert Gilman and Roni Even and Flemming Andreasen},
    title =     {{Session Description Protocol (SDP) Media Capabilities Negotiation}},
    pagetotal = 64,
    year =      2012,
    month =     dec,
    day =       12,
    abstract =  {Session Description Protocol (SDP) capability negotiation provides a general framework for indicating and negotiating capabilities in SDP. The base framework defines only capabilities for negotiating transport protocols and attributes. In this document, we extend the framework by defining media capabilities that can be used to negotiate media types and their associated parameters. This document updates the IANA Considerations of RFC 5939.},
}