%% You should probably cite rfc6884 instead of this I-D.
@techreport{ietf-avt-rtp-evrc-nw-10,
    number =    {draft-ietf-avt-rtp-evrc-nw-10},
    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-avt-rtp-evrc-nw/10/},
    author =    {Zheng Fang},
    title =     {{RTP Payload Format for the Enhanced Variable Rate Narrowband-Wideband Codec (EVRC-NW)}},
    pagetotal = 21,
    year =      2013,
    month =     jan,
    day =       20,
    abstract =  {This document specifies Real-time Transport Protocol (RTP) payload formats to be used for the Enhanced Variable Rate Narrowband-Wideband Codec (EVRC-NW). Three media type registrations are included for EVRC-NW RTP payload formats. In addition, a file format is specified for transport of EVRC-NW speech data in storage mode applications such as email.},
}