%% You should probably cite rfc4040 instead of this I-D.
@techreport{ietf-avt-rtp-clearmode-05,
    number =    {draft-ietf-avt-rtp-clearmode-05},
    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-clearmode/05/},
    author =    {Ruediger Kreuter},
    title =     {{RTP Payload Format for a 64 kbit/s Transparent Call}},
    pagetotal = 8,
    year =      2004,
    month =     apr,
    day =       22,
    abstract =  {This document describes how to carry 64 kbit/s channel data transparently in RTP packets, using a pseudo-codec called "Clearmode". It also serves as registration for a related MIME type called "audio/clearmode". "Clearmode" is a basic feature of VoIP Media Gateways. {[}STANDARDS-TRACK{]}},
}