%% You should probably cite rfc9027 instead of this I-D.
@techreport{ietf-stir-rph-emergency-services-05,
    number =    {draft-ietf-stir-rph-emergency-services-05},
    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-rph-emergency-services/05/},
    author =    {Martin Dolly and Chris Wendt},
    title =     {{Assertion Values for a Resource Priority Header Claim and a SIP Priority Header Claim in Support of Emergency Services Networks}},
    pagetotal = 8,
    year =      2021,
    month =     jan,
    day =       25,
    abstract =  {This document adds new assertion values for a Resource Priority Header ("rph") claim and a new SIP Priority Header claim ("sph") for protection of the "psap-callback" value as part of the "rph" PASSporT extension, in support of the security of Emergency Services Networks for emergency call origination and callback.},
}