%% You should probably cite rfc5002 instead of this I-D.
@techreport{camarillo-sipping-profile-key-02,
    number =    {draft-camarillo-sipping-profile-key-02},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-camarillo-sipping-profile-key/02/},
    author =    {Gonzalo Camarillo and German Blanco},
    title =     {{The Session Initiation Protocol (SIP) P-Profile-Key Private Header (P-Header)}},
    pagetotal = 7,
    year =      2007,
    month =     jun,
    day =       4,
    abstract =  {This document specifies the SIP P-Profile-Key P-header. This header field is used in the 3rd-Generation Partnership Project (3GPP) IMS (IP Multimedia Subsystem) to provide SIP registrars and SIP proxy servers with the key of the profile corresponding to the destination SIP URI of a particular SIP request. This memo provides information for the Internet community.},
}