%% You should probably cite draft-ietf-sipcore-reinvite instead of this I-D.
@techreport{camarillo-sipcore-reinvite-01,
    number =    {draft-camarillo-sipcore-reinvite-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-camarillo-sipcore-reinvite/01/},
    author =    {Gonzalo Camarillo and Christer Holmberg and Gao yang},
    title =     {{Re-INVITE and Target-refresh Request Handling in the Session Initiation Protocol (SIP)}},
    pagetotal = 22,
    year =      2009,
    month =     oct,
    day =       26,
    abstract =  {In this document, we clarify the handling of re-INVITEs in SIP. We clarify in which situations a UAS (User Agent Server) should generate a success response and in which situations a UAS should generate an error response to a re-INVITE. Additionally, we clarify issues related to target-refresh requests.},
}