%% You should probably cite draft-ietf-avt-rtp-amrwbplus instead of this I-D.
@techreport{sjoberg-avt-rtp-amrwbplus-01,
    number =    {draft-sjoberg-avt-rtp-amrwbplus-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-amrwbplus/01/},
    author =    {Johan Sjoberg},
    title =     {{Real-Time Transport Protocol (RTP) Payload Format and Adaptive Multi-Rate Wideband plus (AMR-WB+) Audio Codec}},
    pagetotal = 30,
    year =      2004,
    month =     feb,
    day =       16,
    abstract =  {This document specifies a real-time transport protocol (RTP) payload format to be used for Adaptive Multi-Rate Wideband plus (AMR-WB+) encoded audio signals. The AMR-WB+ codec is an audio extension of the AMR-WB codec providing additional modes designed to give higher quality of music and speech than the original modes. The payload format is designed according to the principles outlined in the existing payload formats for AMR and AMR-WB, RFC3267 {[}9{]}. A MIME type registration is included for AMR-WB+.},
}