RFC 3329 (rfc3329) - Page 1 of 24

Security Mechanism Agreement for the Session Initiation Protocol (SIP)

Alternative Format: Original Text Document
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Network Working Group                                           J. Arkko
Request for Comments: 3329                                   V. Torvinen
Category: Standards Track                                   G. Camarillo
                                                                Ericsson
                                                                A. Niemi
                                                               T. Haukka
                                                                   Nokia
                                                            January 2003


                 Security Mechanism Agreement for the
                   Session Initiation Protocol (SIP)

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2003).  All Rights Reserved.

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.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
      1.1   Motivations . . . . . . . . . . . . . . . . . . . . . . 2
      1.2  Design Goals . . . . . . . . . . . . . . . . . . . . . . 3
      1.3  Conventions  . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Solution . . . . . . . . . . . . . . . . . . . . . . . . . . 3
      2.1   Overview of Operation . . . . . . . . . . . . . . . . . 3
      2.2  Syntax . . . . . . . . . . . . . . . . . . . . . . . . . 4
      2.3  Protocol Operation . . . . . . . . . . . . . . . . . . . 6
         2.3.1 Client Initiated . . . . . . . . . . . . . . . . . . 6
         2.3.2 Server Initiated . . . . . . . . . . . . . . . . . . 8
      2.4  Security Mechanism Initiation. . . . . . . . . . . . . . 9
      2.5  Duration of Security Associations. . . . . . . . . . . .10
      2.6  Summary of Header Field Use. . . . . . . . . . . . . . .10



Arkko, et. al.              Standards Track
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