%% You should probably cite rfc3372 instead of this I-D.
@techreport{ietf-sipping-sipt-04,
    number =    {draft-ietf-sipping-sipt-04},
    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-sipping-sipt/04/},
    author =    {Jon Peterson and Aparna Vemuri},
    title =     {{Session Initiation Protocol for Telephones (SIP-T): Context and Architectures}},
    pagetotal = 23,
    year =      2002,
    month =     jul,
    day =       5,
    abstract =  {The popularity of gateways that interwork between the PSTN (Public Switched Telephone Network) and SIP networks has motivated the publication of a set ofcommon practices that can assure consistent behavior across implementations. This document taxonomizes the uses of PSTN-SIP gateways, provides uses cases, and identifies mechanisms necessary for interworking. The mechanisms detail how SIP provides for both 'encapsulation' (carriage of PSTN signaling across a SIP network) and 'translation' (protocol mapping).},
}