%% You should probably cite rfc7874 instead of this I-D.
@techreport{ietf-rtcweb-audio-04,
    number =    {draft-ietf-rtcweb-audio-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-rtcweb-audio/04/},
    author =    {Jean-Marc Valin and Cary Bran},
    title =     {{WebRTC Audio Codec and Processing Requirements}},
    pagetotal = 6,
    year =      2014,
    month =     jan,
    day =       27,
    abstract =  {This document outlines the audio codec and processing requirements for WebRTC client application and endpoint devices.},
}