@misc{rfc4575,
    series =    {Request for Comments},
    number =    4575,
    howpublished =  {RFC 4575},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC4575},
    url =       {https://www.rfc-editor.org/info/rfc4575},
    author =    {Henning Schulzrinne and Jonathan Rosenberg and Orit Levin},
    title =     {{A Session Initiation Protocol (SIP) Event Package for Conference State}},
    pagetotal = 48,
    year =      2006,
    month =     aug,
    abstract =  {This document defines a conference event package for tightly coupled conferences using the Session Initiation Protocol (SIP) events framework, along with a data format used in notifications for this package. The conference package allows users to subscribe to a conference Uniform Resource Identifier (URI). Notifications are sent about changes in the membership of this conference and optionally about changes in the state of additional conference components. {[}STANDARDS-TRACK{]}},
}