@misc{rfc4904,
    series =    {Request for Comments},
    number =    4904,
    howpublished =  {RFC 4904},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC4904},
    url =       {https://www.rfc-editor.org/info/rfc4904},
    author =    {Cullen Fluffy Jennings and Vijay K. Gurbani},
    title =     {{Representing Trunk Groups in tel/sip Uniform Resource Identifiers (URIs)}},
    pagetotal = 19,
    year =      2007,
    month =     jun,
    abstract =  {This document describes a standardized mechanism to convey trunk group parameters in sip and tel Uniform Resource Identifiers (URIs). An extension to the tel URI is defined for this purpose. {[}STANDARDS-TRACK{]}},
}