%% You should probably cite draft-ietf-enum-vmsg instead of this I-D.
@techreport{livingood-enum-voicemsg-01,
    number =    {draft-livingood-enum-voicemsg-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-livingood-enum-voicemsg/01/},
    author =    {Jason Livingood},
    title =     {{IANA Registration for an Enumservice for Voice Messaging}},
    pagetotal = 12,
    year =      2007,
    month =     sep,
    day =       13,
    abstract =  {This document registers the Enumservice type "voicemsg" with the subtype "sip" using the URI scheme sip, the subtype "tel" using the URI scheme 'tel', the subtype "http" using the URI scheme 'http', and the subtype "https" using the URI scheme 'https' as per the IANA registration process defined in the ENUM specification, RFC 3761. This Enumservice is used to facilitate the real-time routing of voice communications to a voice messaging system.},
}