@misc{rfc4484,
    series =    {Request for Comments},
    number =    4484,
    howpublished =  {RFC 4484},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC4484},
    url =       {https://www.rfc-editor.org/info/rfc4484},
    author =    {Jon Peterson and Douglas Sicker and Hannes Tschofenig and James Polk},
    title =     {{Trait-Based Authorization Requirements for the Session Initiation Protocol (SIP)}},
    pagetotal = 15,
    year =      2006,
    month =     aug,
    abstract =  {This document lays out a set of requirements related to trait-based authorization for the Session Initiation Protocol (SIP). While some authentication mechanisms are described in the base SIP specification, trait-based authorization provides information used to make policy decisions based on the attributes of a participant in a session. This approach provides a richer framework for authorization, as well as allows greater privacy for users of an identity system. This memo provides information for the Internet community.},
}