%% You should probably cite draft-ietf-enum-softswitch-req instead of this I-D.
@techreport{lim-kim-enum-based-softswitch-01,
    number =    {draft-lim-kim-enum-based-softswitch-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-lim-kim-enum-based-softswitch/01/},
    author =    {JoonHyung Lim},
    title =     {{ENUM-based Softswitch Requirement}},
    pagetotal = 9,
    year =      2007,
    month =     mar,
    day =       2,
    abstract =  {This document describes operational requirement and several considerations for ENUM-based softswitch, which can route a call between 2 Korean VoIP carriers during the ENUM pre-commercial trial hosted by National Internet Development Agency of Korea(NIDA) in 2006. This experience can be one of interim solution to maintain stability of on-going commercial softswitch system while initial stage of ENUM service that does not have sufficient data.},
}