%% You should probably cite rfc8588 instead of this I-D.
@techreport{ietf-stir-passport-shaken-06,
    number =    {draft-ietf-stir-passport-shaken-06},
    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-stir-passport-shaken/06/},
    author =    {Chris Wendt and Mary Barnes},
    title =     {{PASSporT SHAKEN Extension (SHAKEN)}},
    pagetotal = 9,
    year =      2018,
    month =     dec,
    day =       6,
    abstract =  {This document extends PASSporT, which is a token object that conveys cryptographically-signed information about the participants involved in communications. The extension is defined, corresponding to the SHAKEN specification, to provide both a specific set of levels-of- confidence in the correctness of the originating identity for a SIP based Communication Service Provider (CSP) telephone network originated call as well as an identifier that allows the CSP to uniquely identify the origin of the call within its network.},
}