End-to-middle security in the Session Initiation Protocol(SIP)

Document Type Expired Internet-Draft (individual)
Authors Kinji Ono  , Shinya Tachimoto 
Last updated 2005-02-21
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Some services provided by intermediaries depend on the ability to inspect the message bodies in the Session Initiation Protocol (SIP). When sensitive information is included in these bodies, a SIP User Agent (UA) needs to protect it from intermediaries except those that the UA agreed to disclose it to. This document proposes a mechanism for securing information passed between an end user and intermediaries using S/MIME. It also proposes mechanisms for an intermediary to notify the UA about its need to inspect an S/MIME-secured message body, and to notify the need for the message body to be transmitted securely.


Kinji Ono (ono@nacsis.ac.jp)
Shinya Tachimoto (tachimoto.shinya@lab.ntt.co.jp)

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)