@misc{rfc3329,
    series =    {Request for Comments},
    number =    3329,
    howpublished =  {RFC 3329},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC3329},
    url =       {https://www.rfc-editor.org/info/rfc3329},
    author =    {Gonzalo Camarillo and Vesa Torvinen and Jari Arkko and Aki Niemi and Tao Haukka},
    title =     {{Security Mechanism Agreement for the Session Initiation Protocol (SIP)}},
    pagetotal = 24,
    year =      2003,
    month =     jan,
    abstract =  {This document defines new functionality for negotiating the security mechanisms used between a Session Initiation Protocol (SIP) user agent and its next-hop SIP entity. This new functionality supplements the existing methods of choosing security mechanisms between SIP entities.},
}