%% You should probably cite draft-ietf-enum-voice instead of this I-D.
@techreport{brandner-enum-voice-00,
    number =    {draft-brandner-enum-voice-00},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-brandner-enum-voice/00/},
    author =    {Rudolf Brandner},
    title =     {{IANA Registration for Enumservice Voice}},
    pagetotal = 12,
    year =      2005,
    month =     jul,
    day =       7,
    abstract =  {This document registers the ENUMservice "voice" (which has a defined sub-type "tel"), as per the IANA registration process defined in the ENUM specification RFC3761. This service indicates that the contact held in the generated URI can be used to initiate an interactive voice (audio) call.},
}