@misc{rfc7044,
    series =    {Request for Comments},
    number =    7044,
    howpublished =  {RFC 7044},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC7044},
    url =       {https://www.rfc-editor.org/info/rfc7044},
    author =    {Mary Barnes and Francois Audet and Shida Schubert and Hans Erik van Elburg and Christer Holmberg},
    title =     {{An Extension to the Session Initiation Protocol (SIP) for Request History Information}},
    pagetotal = 36,
    year =      2014,
    month =     feb,
    abstract =  {This document defines a standard mechanism for capturing the history information associated with a Session Initiation Protocol (SIP) request. This capability enables many enhanced services by providing the information as to how and why a SIP request arrives at a specific application or user. This document defines an optional SIP header field, History-Info, for capturing the history information in requests. The document also defines SIP header field parameters for the History-Info and Contact header fields to tag the method by which the target of a request is determined. In addition, this specification defines a value for the Privacy header field that directs the anonymization of values in the History-Info header field. This document obsoletes RFC 4244.},
}