Enhancements for Authenticated Identity Management in the Session Initiation Protocol (SIP)
RFC 4474

Approval announcement
Draft of message to be sent after approval:

From: The IESG <iesg-secretary@ietf.org>
To: IETF-Announce <ietf-announce@ietf.org>
Cc: Internet Architecture Board <iab@iab.org>,
    RFC Editor <rfc-editor@rfc-editor.org>, 
    sip mailing list <sip@ietf.org>, 
    sip chair <sip-chairs@tools.ietf.org>
Subject: Protocol Action: 'Enhancements for Authenticated 
         Identity Management in the Session Initiation Protocol (SIP)' to 
         Proposed Standard 

The IESG has approved the following document:

- 'Enhancements for Authenticated Identity Management in the Session 
   Initiation Protocol (SIP) '
   <draft-ietf-sip-identity-07.txt> as a Proposed Standard

This document is the product of the Session Initiation Protocol Working 

The IESG contact persons are Allison Mankin and Jon Peterson.

A URL of this Internet-Draft is:

Technical Summary
   The existing security mechanisms in the Session Initiation Protocol
   are inadequate for cryptographically assuring the identity of the end
   users that originate SIP requests, especially in an interdomain
   context.  This document specifies a mechanism for securely identifying
   originators of SIP messages.  It does so by defining two new SIP
   header fields, Identity, for conveying a signature used for
   validating the identity, and Identity-Info, for conveying a reference
   to the certificate of the signer.  It specifies the mechanisms and
   procedures for using these and how they can be used with the
   existing SIP privacy capabilities.

   It is desirable for SIP user agents to be able to send requests to
   destinations with which they have no previous association - just as
   in the telephone network today, one can receive a call from someone
   with whom one has no previous association, and still have a
   reasonable assurance that their displayed Caller-ID is accurate.  A
   cryptographic approach, like the one described in this document, can
   probably provide a much stronger and less-spoofable assurance of
   identity than the telephone network provides today.

Working Group Summary
 This specification required a number of tries and much analysis.  
 There was strong consensus on the solution by the time it reached
 the version in this draft.
Protocol Quality
 Eric Rescorla provided early architectural review of the work.
 The careful reading by the GEN-ART reviewer, Lakshminath
 Dondeti was valuable.  Allison Mankin is the Responsible Area Director.