%% You should probably cite rfc8760 instead of this I-D.
@techreport{ietf-sipcore-digest-scheme-15,
    number =    {draft-ietf-sipcore-digest-scheme-15},
    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-digest-scheme/15/},
    author =    {Rifaat Shekh-Yusef},
    title =     {{The Session Initiation Protocol (SIP) Digest Access Authentication Scheme}},
    pagetotal = 9,
    year =      2019,
    month =     nov,
    day =       4,
    abstract =  {This document updates RFC 3261 by modifying the Digest Access Authentication scheme used by the Session Initiation Protocol (SIP) to add support for more secure digest algorithms, e.g., SHA-256 and SHA-512/256, to replace the obsolete MD5 algorithm.},
}