@misc{rfc4321,
    series =    {Request for Comments},
    number =    4321,
    howpublished =  {RFC 4321},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC4321},
    url =       {https://www.rfc-editor.org/info/rfc4321},
    author =    {Robert Sparks},
    title =     {{Problems Identified Associated with the Session Initiation Protocol's (SIP) Non-INVITE Transaction}},
    pagetotal = 10,
    year =      2006,
    month =     jan,
    abstract =  {This document describes several problems that have been identified with the Session Initiation Protocol's (SIP) non-INVITE transaction. This memo provides information for the Internet community.},
}