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URNs for the Alert-Info Header Field of the Session Initiation Protocol (SIP)

Document type: Active Internet-Draft (salud WG)
Document stream: IETF
Last updated: 2014-12-10 (latest revision 2014-10-17)
Intended RFC status: Proposed Standard
Other versions: plain text, xml, pdf, html

IETF State: Submitted to IESG for Publication
Consensus: Yes
Document shepherd: Christer Holmberg
Shepherd Write-Up: Last changed 2014-03-10

IESG State: RFC Ed Queue
IANA Action State: RFC-Ed-Ack
RFC Editor State: AUTH48
Responsible AD: Richard Barnes
Send notices to:,,

SALUD                                                      L. Liess, Ed.
Internet-Draft                                                 R. Jesske
Updates: 3261 (if approved)                          Deutsche Telekom AG
Intended status: Standards Track                             A. Johnston
Expires: April 20, 2015                                            Avaya
                                                               D. Worley
                                                              P. Kyzivat
                                                        October 17, 2014

URNs for the Alert-Info Header Field of the Session Initiation Protocol


   The Session Initiation Protocol (SIP) supports the capability to
   provide a reference to a specific rendering to be used by the UA as
   an alerting signal (e.g., a ring tone or ringback tone) when the user
   is alerted.  This is done using the Alert-Info header field.
   However, the reference (typically a URL) addresses only a specific
   network resource with specific rendering properties.  There is
   currently no support for standard identifiers for describing the
   semantics of the alerting situation or the characteristics of the
   alerting signal, without being tied to a particular rendering.  To
   overcome these limitations and support new applications, a new family
   of URNs for use in Alert-Info header fields (and situations with
   similar requirements) is defined in this specification.

   This document normatively updates RFC3261, which defines the Session
   Initiation Protocol (SIP): It changes the usage of the Alert-Info
   header field defined in RFC3261 by additionally allowing its use in
   any non-100 provisional response to INVITE.This document also permits
   proxies to add or remove an Alert-Info header field, and to add or
   remove Alert-Info header field values.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at

Liess, et al.            Expires April 20, 2015                 [Page 1]
Internet-Draft                 Alert URNs                   October 2014

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on April 20, 2015.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   6
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   6
   4.  Updates to RFC 3261 . . . . . . . . . . . . . . . . . . . . .   6
     4.1.  Allow Alert-Info in Provisional Responses . . . . . . . .   6
     4.2.  Proxies May Alter Alert-Info Header Fields  . . . . . . .   7

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