%% You should probably cite rfc3841 instead of this I-D.
@techreport{ietf-sip-callerprefs-10,
    number =    {draft-ietf-sip-callerprefs-10},
    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-sip-callerprefs/10/},
    author =    {Henning Schulzrinne and Jonathan Rosenberg and Paul Kyzivat},
    title =     {{Caller Preferences for the Session Initiation Protocol (SIP)}},
    pagetotal = 26,
    year =      2003,
    month =     oct,
    day =       23,
    abstract =  {This document describes a set of extensions to the Session Initiation Protocol (SIP) which allow a caller to express preferences about request handling in servers. These preferences include the ability to select which Uniform Resource Identifiers (URI) a request gets routed to, and to specify certain request handling directives in proxies and redirect servers. It does so by defining three new request header fields, Accept-Contact, Reject-Contact, and Request-Disposition, which specify the caller's preferences. {[}STANDARDS-TRACK{]}},
}