%% You should probably cite draft-jennings-stir-rfc4474bis instead of this I-D.
@techreport{jennings-dispatch-rfc4474bis-00,
    number =    {draft-jennings-dispatch-rfc4474bis-00},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-jennings-dispatch-rfc4474bis/00/},
    author =    {Jon Peterson and Cullen Fluffy Jennings and Eric Rescorla},
    title =     {{Authenticated Identity Management in the Session Initiation Protocol (SIP)}},
    pagetotal = 42,
    year =      2013,
    month =     may,
    day =       29,
    abstract =  {The existing security mechanisms in the Session Initiation Protocol (SIP) are inadequate for cryptographically assuring the identity of the end users that originate SIP requests, especially in an interdomain context. This document defines a mechanism for securely identifying originators of SIP messages. It does so by defining two new SIP header fields, Identity, for conveying a signature used for validating the identity, and Identity-Info, for conveying a reference to the certificate of the signer.},
}