@misc{rfc3420,
    series =    {Request for Comments},
    number =    3420,
    howpublished =  {RFC 3420},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC3420},
    url =       {https://www.rfc-editor.org/info/rfc3420},
    author =    {Robert Sparks},
    title =     {{Internet Media Type message/sipfrag}},
    pagetotal = 8,
    year =      2002,
    month =     nov,
    abstract =  {This document registers the message/sipfrag Multipurpose Internet Mail Extensions (MIME) media type. This type is similar to message/sip, but allows certain subsets of well formed Session Initiation Protocol (SIP) messages to be represented instead of requiring a complete SIP message. In addition to end-to-end security uses, message/sipfrag is used with the REFER method to convey information about the status of a referenced request. {[}STANDARDS-TRACK{]}},
}