%% You should probably cite draft-ietf-avt-rtp-amr instead of this I-D.
@techreport{sjoberg-avt-rtp-amr-01,
    number =    {draft-sjoberg-avt-rtp-amr-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-sjoberg-avt-rtp-amr/01/},
    author =    {Johan Sjoberg and Magnus Westerlund},
    title =     {{RTP payload format for AMR}},
    pagetotal = 15,
    year =      2000,
    month =     jul,
    day =       18,
    abstract =  {This document describes a proposed real-time transport protocol (RTP) {[}8{]} payload format for AMR speech encoded {[}1{]} signals. The AMR payload format is designed to be able to interoperate with existing AMR transport formats. This document also includes a MIME type registration for AMR. The MIME type is specified for both real-time transport and storage.},
}