@misc{rfc4488,
    series =    {Request for Comments},
    number =    4488,
    howpublished =  {RFC 4488},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC4488},
    url =       {https://www.rfc-editor.org/info/rfc4488},
    author =    {Orit Levin},
    title =     {{Suppression of Session Initiation Protocol (SIP) REFER Method Implicit Subscription}},
    pagetotal = 8,
    year =      2006,
    month =     may,
    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{]}},
}