%% You should probably cite rfc7316 instead of this I-D.
@techreport{vanelburg-dispatch-private-network-ind-05,
    number =    {draft-vanelburg-dispatch-private-network-ind-05},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-vanelburg-dispatch-private-network-ind/05/},
    author =    {Hans Erik van Elburg and Keith Drage and Mayumi Ohsugi and Shida Schubert and Kenjiro Arai},
    title =     {{The Session Initiation Protocol (SIP) P-Private-Network-Indication Private-Header (P-Header)}},
    pagetotal = 21,
    year =      2014,
    month =     feb,
    day =       4,
    abstract =  {This document specifies the SIP P-Private-Network-Indication P-header used by the 3rd-Generation Partnership Project (3GPP). The P-Private-Network-Indication indicates that the message is part of the message traffic of a private network, and identifies that private network. A private network indication allows nodes to treat private network traffic according to a different set of rules than the set applicable to public network traffic.},
}