%% You should probably cite rfc3262 instead of this I-D.
@techreport{ietf-sip-100rel-06,
    number =    {draft-ietf-sip-100rel-06},
    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-sip-100rel/06/},
    author =    {Henning Schulzrinne and Jonathan Rosenberg},
    title =     {{Reliability of Provisional Responses in Session Initiation Protocol (SIP)}},
    pagetotal = 14,
    year =      2002,
    month =     feb,
    day =       28,
    abstract =  {This document specifies an extension to the Session Initiation Protocol (SIP) providing reliable provisional response messages. This extension uses the option tag 100rel and defines the Provisional Response ACKnowledgement (PRACK) method. {[}STANDARDS-TRACK{]}},
}