%% You should probably cite rfc3976 instead of this I-D.
@techreport{gurbani-sin-02,
    number =    {draft-gurbani-sin-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-gurbani-sin/02/},
    author =    {F Haerens and Vidhi Rastogi and Vijay K. Gurbani},
    title =     {{Interworking SIP and Intelligent Network (IN) Applications}},
    pagetotal = 25,
    year =      2002,
    month =     jun,
    day =       21,
    abstract =  {Public Switched Telephone Network (PSTN) services such as 800-number routing (freephone), time-and-day routing, credit-card calling, and virtual private network (mapping a private network number into a public number) are realized by the Intelligent Network (IN). This document addresses means to support existing IN services from Session Initiation Protocol (SIP) endpoints for an IP-host-to-phone call. The call request is originated on a SIP endpoint, but the services to the call are provided by the data and procedures resident in the PSTN/IN. To provide IN services in a transparent manner to SIP endpoints, this document describes the mechanism for interworking SIP and Intelligent Network Application Part (INAP). This memo provides information for the Internet community.},
}