%% You should probably cite rfc3853 instead of this I-D.
@techreport{ietf-sip-smime-aes-01,
    number =    {draft-ietf-sip-smime-aes-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-ietf-sip-smime-aes/01/},
    author =    {Jon Peterson},
    title =     {{S/MIME Advanced Encryption Standard (AES) Requirement for the Session Initiation Protocol (SIP)}},
    pagetotal = 6,
    year =      2003,
    month =     jul,
    day =       2,
    abstract =  {RFC 3261 currently specifies 3DES as the mandatory-to-implement ciphersuite for implementations of S/MIME in the Session Initiation Protocol (SIP). This document updates the normative guidance of RFC 3261 to require the Advanced Encryption Standard (AES) for S/MIME. {[}STANDARDS-TRACK{]}},
}