%% You should probably cite draft-ibc-sipcore-sip-websocket instead of this I-D.
@techreport{ibc-rtcweb-sip-websocket-00,
    number =    {draft-ibc-rtcweb-sip-websocket-00},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-ibc-rtcweb-sip-websocket/00/},
    author =    {Jose Luis Millan and Inaki Baz Castillo and Victor Pascual},
    title =     {{WebSocket Transport for Session Initiation Protocol (SIP)}},
    pagetotal = 27,
    year =      2011,
    month =     sep,
    day =       13,
    abstract =  {This document specifies a WebSocket subprotocol for a new transport in SIP (Session Initiation Protocol). The WebSocket protocol enables two-way realtime communication between clients (typically web-based applications) and servers. The main goal of this specification is to integrate the SIP protocol within web applications.},
}