@techreport{sliwa-stir-oob-transparent-discovery-00,
    number =    {draft-sliwa-stir-oob-transparent-discovery-00},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-sliwa-stir-oob-transparent-discovery/00/},
    author =    {Robert Śliwa and Chris Wendt},
    title =     {{Transparent Discovery of STIR Out-of-Band Call Placement Services}},
    pagetotal = 10,
    year =      2025,
    month =     sep,
    day =       5,
    abstract =  {This document defines a Discovery Service for STIR Out-of-Band (OOB) Call Placement Services (CPS). The Discovery Service enables Authentication Services (AS) and Verification Services (VS) to quickly determine which CPS is responsible for a given telephone number (TN) or Service Provider Code (SPC), allowing retrieval of PASSporTs even when SIP Identity headers are removed by non-IP or hybrid network segments. The Discovery Service leverages a CPS URI certificate extension, which allows STIR Certificates or Delegate Certificates to embed an HTTPS URI for the CPS serving the TNs or SPCs covered by the certificate.},
}