%% You should probably cite rfc8898 instead of this I-D.
@techreport{ietf-sipcore-sip-token-authnz-08,
    number =    {draft-ietf-sipcore-sip-token-authnz-08},
    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-sipcore-sip-token-authnz/08/},
    author =    {Rifaat Shekh-Yusef and Christer Holmberg and Victor Pascual},
    title =     {{Third-Party Token-based Authentication and Authorization for Session Initiation Protocol (SIP)}},
    pagetotal = 13,
    year =      2020,
    month =     feb,
    day =       19,
    abstract =  {This document defines a SIP mechanism that relies on the OAuth 2.0 and OpenID Connect Core 1.0 to enable delegation of the user authentication and SIP registration authorization to a third-party. The document updates RFC 3261.},
}