%% You should probably cite rfc5574 instead of this I-D.
@techreport{ietf-avt-rtp-speex-07,
    number =    {draft-ietf-avt-rtp-speex-07},
    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-speex/07/},
    author =    {Aymeric Moizard and Greg Herlein and Jean-Marc Valin and Alfred Heggestad},
    title =     {{RTP Payload Format for the Speex Codec}},
    pagetotal = 14,
    year =      2009,
    month =     may,
    day =       7,
    abstract =  {Speex is an open-source voice codec suitable for use in VoIP (Voice over IP) type applications. This document describes the payload format for Speex-generated bit streams within an RTP packet. Also included here are the necessary details for the use of Speex with the Session Description Protocol (SDP). {[}STANDARDS-TRACK{]}},
}