Authenticated Identity Management in the Session Initiation Protocol (SIP)
RFC 8224

Approval announcement
Draft of message to be sent after approval:

From: The IESG <>
To: IETF-Announce <>
Cc: The IESG <>,,,, Robert Sparks <>,,,
Subject: Protocol Action: 'Authenticated Identity Management in the Session Initiation Protocol (SIP)' to Proposed Standard (draft-ietf-stir-rfc4474bis-16.txt)

The IESG has approved the following document:
- 'Authenticated Identity Management in the Session Initiation Protocol
  (draft-ietf-stir-rfc4474bis-16.txt) as Proposed Standard

This document is the product of the Secure Telephone Identity Revisited
Working Group.

The IESG contact persons are Adam Roach, Alexey Melnikov and Ben

A URL of this Internet Draft is:

Technical Summary

The baseline security mechanisms in the Session Initiation Protocol
   (SIP) are inadequate for cryptographically assuring the identity of
   the end users that originate SIP requests, especially in an
   interdomain context.  This document defines a mechanism for securely
   identifying originators of SIP requests.  It does so by defining a
   SIP header field for conveying a signature used for validating the
   identity, and for conveying a reference to the credentials of the

The changes from RFC4474 are significant, and detailed in the document. The
syntax defined in this document is not backwards compatible with RFC4474 (and
this is discussed explicitly in the document). There are no known deployed
implementations of RFC4474.

Working Group Summary

This document has undergone heavy review. The syntax and expressivity of the
protocol changed significantly during its development, particularly when
reconciling early tension with the SHAKEN effort. The feedback from that effort
led to the use of the passport concepts defined in draft-ietf-stir-passport. 

Recent versions of this document were implemented and tested at the SIP Forum
SIPit test event in September. Feedback from that event informed improvements
to both the protocol and the prose in the document. Those implementations are
tracking the changes made in the latest versions.

The document suite has been through three working group last calls, the third
of which was abbreviated to one week. The first last call stimulated
significant discussion, some of which was heated. Dave Crocker, in particular,
provided a large amount of feedback during the first last call, indicating
disagreement with the overall approach the working group has taken. Working
through the comments led to improvements in the documents.

Document Quality

This document is a component of a toolset for combating robocalling. In the
US, the FCC is applying significant pressure to the industry to deter
robocalling (with deadlines in the last part of 2016). An industry-led strike
force is moving towards deployment of a solution that uses that toolset. The
ATIS/SIP Forum IPNNI Task Force's SHAKEN solution relies on the toolset defined
by STIR and profiles it for deployment in the North American market.


The document shepherd is Robert Sparks. The responsible AD is Adam Roach.

RFC Editor Note

Please fix the following editorial nits introduced in this version:

Introduction; old text:
 identity can provide a much stronger and assurance of identity than
New text:
 identity can provide a much stronger assurance of identity than

Section 6.1.1; old text:
   would retry such a request as a ssequential for, by re-processing the
New text:
   would retry such a request as a sequential fork, by re-processing the
(note two typos fixed: the spelling of "sequential", and the change from "for" to "fork").