%% You should probably cite rfc8498 instead of this I-D.
@techreport{ietf-sipcore-originating-cdiv-parameter-02,
    number =    {draft-ietf-sipcore-originating-cdiv-parameter-02},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-ietf-sipcore-originating-cdiv-parameter/02/},
    author =    {Marianne Mohali},
    title =     {{A P-Served-User Header Field Parameter for Originating CDIV session case in Session Initiation Protocol (SIP)}},
    pagetotal = 13,
    year =      2018,
    month =     may,
    day =       22,
    abstract =  {The P-Served-User header field RFC5502 is used to convey the identity of the served user and the session case that applies to this particular communication session and application invocation. This document updated RFC5502 by defining a new P-Served-User header field parameter, "orig-cdiv". The parameter conveys the session case used by a proxy when handling an originating session after Call Diversion (CDIV) services has been invoked for the served user. This document also fixes the ABNF in RFC5502 and provides more guidance for using the P-Served-User header field in IP networks.},
}