@techreport{camarillo-sipping-multiple-refer-00,
    number =    {draft-camarillo-sipping-multiple-refer-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-camarillo-sipping-multiple-refer/00/},
    author =    {Gonzalo Camarillo},
    title =     {{Refering to Multiple Resources in the Session Initiation Protocol (SIP)}},
    pagetotal = 11,
    year =      2004,
    month =     feb,
    day =       9,
    abstract =  {This document defines extensions to the SIP REFER method so that this method can be used to refer to multiple resources. These extensions include the use of pointers to URI-lists in the Refer-To header field, the use of bodies to describe the requests to be sent by the server, and the use of a new event package to report the state of several transactions.},
}