%% You should probably cite draft-ietf-codec-requirements instead of this I-D.
@techreport{valin-codec-requirements-02,
    number =    {draft-valin-codec-requirements-02},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-valin-codec-requirements/02/},
    author =    {Jean-Marc Valin and Slava Borilin and Koen Vos and Christopher Montgomery and Juin-Hwey Chen},
    title =     {{Codec Requirements}},
    pagetotal = 22,
    year =      2009,
    month =     oct,
    day =       26,
    abstract =  {This document provides specific requirements for Internet audio codecs. These requirements address quality, sampling rate, bit-rate, and packet loss robustness, as well as other desirable properties.},
}