@techreport{cao-sip-response-auth-01,
    number =    {draft-cao-sip-response-auth-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-cao-sip-response-auth/01/},
    author =    {Dr. Feng Cao},
    title =     {{Response Authentication in Session Initiation Protocol}},
    pagetotal = 15,
    year =      2006,
    month =     jan,
    day =       10,
    abstract =  {This draft describes some extensions for enhancing SIP response authentication. In the real-world SIP deployment, TLS may be not available on some hops. Due to the lack of other response authentication mechanisms in SIP, several kinds of security attacks could be conducted on those hops through SIP response. This draft suggests some approaches for complementary enhancement on SIP response authentication. With the new per-hop response authentication proposed in this draft, the security gaps on the hops without TLS can be bridged.},
}