%% You should probably cite draft-ietf-sip-identity instead of this I-D.
@techreport{peterson-sip-identity-01,
    number =    {draft-peterson-sip-identity-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-peterson-sip-identity/01/},
    author =    {Jon Peterson},
    title =     {{Enhancements for Authenticated Identity Management in the Session Initiation Protocol (SIP)}},
    pagetotal = 29,
    year =      2002,
    month =     jul,
    day =       5,
    abstract =  {The existing mechanisms for expressing identity in the Session Initiation Protocol oftentimes do not permit an administrative domain to verify securely the identity of the originator of a request. This document recommends practices and conventions for authenticating end users, and proposes a way to distribute secure authenticated identities within SIP messages.},
}