%% You should probably cite rfc7092 instead of this I-D.
@techreport{ietf-straw-b2bua-taxonomy-00,
    number =    {draft-ietf-straw-b2bua-taxonomy-00},
    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-straw-b2bua-taxonomy/00/},
    author =    {Hadriel Kaplan},
    title =     {{A Taxonomy of Session Initiation Protocol (SIP) Back-to-Back User Agents}},
    pagetotal = 9,
    year =      2012,
    month =     nov,
    day =       6,
    abstract =  {There are numerous types of SIP Back-to-Back User Agents (B2BUAs), performing different roles in different ways. This document identifies several common B2BUA roles, in order to provide taxonomy other documents can use and reference.},
}