%% You should probably cite rfc6502 instead of this I-D.
@techreport{ietf-xcon-event-package-01,
    number =    {draft-ietf-xcon-event-package-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-ietf-xcon-event-package/01/},
    author =    {Gonzalo Camarillo and Srivatsa Srinivasan and Roni Even and Jari Urpalainen},
    title =     {{Conference Event Package Data Format Extension for Centralized Conferencing (XCON)}},
    pagetotal = 14,
    year =      2008,
    month =     sep,
    day =       3,
    abstract =  {This document specifies the notification mechanism for XCON (centralized conferencing). This mechanism reuses the SIP (Session Initiation Protocol) event package for conference state. Additionally, the notification mechanism includes support for the XCON data model and for partial notifications. {[}STANDARDS-TRACK{]}},
}