@misc{rfc3891,
    series =    {Request for Comments},
    number =    3891,
    howpublished =  {RFC 3891},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC3891},
    url =       {https://www.rfc-editor.org/info/rfc3891},
    author =    {Rohan Mahy and Billy Biggs and Rick Dean},
    title =     {{The Session Initiation Protocol (SIP) "Replaces" Header}},
    pagetotal = 16,
    year =      2004,
    month =     sep,
    abstract =  {This document defines a new header for use with Session Initiation Protocol (SIP) multi-party applications and call control. The Replaces header is used to logically replace an existing SIP dialog with a new SIP dialog. This primitive can be used to enable a variety of features, for example: "Attended Transfer" and "Call Pickup". Note that the definition of these example features is non-normative. {[}STANDARDS-TRACK{]}},
}