%% You should probably cite rfc8226 instead of this I-D.
@techreport{ietf-stir-certificates-02,
    number =    {draft-ietf-stir-certificates-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-ietf-stir-certificates/02/},
    author =    {Jon Peterson and Sean Turner},
    title =     {{Secure Telephone Identity Credentials: Certificates}},
    pagetotal = 15,
    year =      2015,
    month =     jul,
    day =       6,
    abstract =  {In order to prove ownership of telephone numbers on the Internet, some kind of public infrastructure needs to exist that binds cryptographic keys to authority over telephone numbers. This document describes a certificate-based credential system for telephone numbers, which could be used as a part of a broader architecture for managing telephone numbers as identities in protocols like SIP.},
}