%% You should probably cite rfc5552 instead of this I-D.
@techreport{ietf-mediactrl-vxml-04,
    number =    {draft-ietf-mediactrl-vxml-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-mediactrl-vxml/04/},
    author =    {Mark Scott and Dave Burke},
    title =     {{SIP Interface to VoiceXML Media Services}},
    pagetotal = 36,
    year =      2009,
    month =     feb,
    day =       8,
    abstract =  {This document describes a SIP interface to VoiceXML media services. Commonly, Application Servers controlling Media Servers use this protocol for pure VoiceXML processing capabilities. This protocol is an adjunct to the full MEDIACTRL protocol and packages mechanism. {[}STANDARDS-TRACK{]}},
}