%% You should probably cite rfc4488 instead of this I-D.
@techreport{ietf-sip-refer-with-norefersub-04,
    number =    {draft-ietf-sip-refer-with-norefersub-04},
    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-sip-refer-with-norefersub/04/},
    author =    {Orit Levin},
    title =     {{Suppression of Session Initiation Protocol (SIP) REFER Method Implicit Subscription}},
    pagetotal = 8,
    year =      2006,
    month =     jan,
    day =       17,
    abstract =  {The Session Initiation Protocol (SIP) REFER extension as defined in RFC 3515 automatically establishes a typically short-lived event subscription used to notify the party sending a REFER request about the receiver's status in executing the transaction requested by the REFER. These notifications are not needed in all cases. This specification provides a way to prevent the automatic establishment of an event subscription and subsequent notifications using a new SIP extension header field that may be included in a REFER request. {[}STANDARDS-TRACK{]}},
}