%% You should probably cite draft-york-p-charge-info instead of this I-D.
@techreport{york-dispatch-p-charge-info-01,
    number =    {draft-york-dispatch-p-charge-info-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-york-dispatch-p-charge-info/01/},
    author =    {Dan York and Tolga Asveren},
    title =     {{P-Charge-Info - A Private Header (P-Header) Extension to the Session Initiation Protocol (SIP)}},
    pagetotal = 15,
    year =      2013,
    month =     mar,
    day =       15,
    abstract =  {This text documents 'P-Charge-Info', an existing private Session Initiation Protocol (SIP) header (P-header) used to convey billing information about the party to be charged. This P-Header is currently in production usage by a number of equipment vendors and carriers and this document is submitted to request the registration of this header with IANA. This P-Header may also be used in some situations to carry the ISUP Charge Number parameter for PSTN interconnection. NOTE: This document has been in development since 2008 under the name draft-york-sipping-p-charge-info. This -01 document is identical to draft-york-sipping-p-charge-info-15 except for edits to the text to indicate this is now for the DISPATCH working group as the SIPPING working group no longer exists.},
}