%% You should probably cite rfc4024 instead of this I-D.
@techreport{ema-vpim-cb-02,
    number =    {draft-ema-vpim-cb-02},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-ema-vpim-cb/02/},
    author =    {Janusz Maruszak and Glenn Parsons},
    title =     {{Voice Messaging Client Behaviour}},
    pagetotal = 9,
    year =      2001,
    month =     jul,
    day =       24,
    abstract =  {This document defines the expected behaviour of a client to various aspects of a Voice Profile for Internet Mail (VPIM) message or any voice and/or fax message. This memo provides information for the Internet community.},
}