%% You should probably cite rfc5341 instead of this I-D.
@techreport{ietf-iptel-tel-reg-06,
    number =    {draft-ietf-iptel-tel-reg-06},
    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-iptel-tel-reg/06/},
    author =    {Cullen Fluffy Jennings and Vijay K. Gurbani},
    title =     {{The Internet Assigned Number Authority (IANA) tel Uniform Resource Identifier (URI) Parameter Registry}},
    pagetotal = 7,
    year =      2008,
    month =     jun,
    day =       19,
    abstract =  {This document creates an Internet Assigned Number Authority (IANA) registry for tel Uniform Resource Identifier (URI) parameters and their values. It populates the registry with the parameters defined in the tel URI specification, along with the parameters in tel URI extensions defined for number portability and trunk groups. {[}STANDARDS-TRACK{]}},
}