%% You should probably cite rfc2995 instead of this I-D.
@techreport{ietf-spirits-implementations-02,
    number =    {draft-ietf-spirits-implementations-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-ietf-spirits-implementations/02/},
    author =    {Weizhong Zhang and Igor Faynberg and Mark Weissman and Shinji Ago and John Yoakum and Lewis C. Robart and Soren Nyckelgard and Sung Rhim and S Hadvani and John Voelker and Hui-Lan Lu and S Moeenuddin and Jinkyung Hwang},
    title =     {{Pre-Spirits Implementations of PSTN-initiated Services}},
    pagetotal = 44,
    year =      2000,
    month =     sep,
    day =       15,
    abstract =  {This document describes four existing implementations of SPIRITS-like services from Korea Telecom, Lucent Technologies, NEC, and Telia in cooperation with Nortel Networks. SPIRITS-like services are those originating in the Public Switched Telephone Network (PSTN) and necessitating the interactions of the Internet and PSTN. This memo provides information for the Internet community.},
}