%% You should probably cite rfc4321 instead of this I-D.
@techreport{sparks-sip-nit-problems-02,
    number =    {draft-sparks-sip-nit-problems-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-sparks-sip-nit-problems/02/},
    author =    {Robert Sparks},
    title =     {{Problems Identified Associated with the Session Initiation Protocol's (SIP) Non-INVITE Transaction}},
    pagetotal = 10,
    year =      2005,
    month =     jan,
    day =       4,
    abstract =  {This document describes several problems that have been identified with the Session Initiation Protocol's (SIP) non-INVITE transaction. This memo provides information for the Internet community.},
}