URNs for the Alert-Info Header Field of the Session Initiation Protocol (SIP)
RFC 7462

 
Document Type RFC - Proposed Standard (March 2015; No errata)
Updates RFC 3261
Last updated 2015-03-25
Replaces draft-liess-dispatch-alert-info-urns
Stream IETF
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Stream WG state Submitted to IESG for Publication
Consensus Yes
Document shepherd Christer Holmberg
Shepherd write-up Show (last changed 2014-03-10)
IESG IESG state RFC 7462 (Proposed Standard)
Telechat date
Responsible AD Richard Barnes
Send notices to salud-chairs@ietf.org, draft-ietf-salud-alert-info-urns@ietf.org, christer.holmberg@ericsson.com
IANA IANA review state Version Changed - Review Needed
IANA action state RFC-Ed-Ack
Internet Engineering Task Force (IETF)                     L. Liess, Ed.
Request for Comments: 7462                                     R. Jesske
Updates: 3261                                        Deutsche Telekom AG
Category: Standards Track                                    A. Johnston
ISSN: 2070-1721                                                    Avaya
                                                               D. Worley
                                                                 Ariadne
                                                              P. Kyzivat
                                                                  Huawei
                                                              March 2015

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

Abstract

   The Session Initiation Protocol (SIP) supports the capability to
   provide a reference to a specific rendering to be used by the User
   Agent (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 RFC 3261, which defines the Session
   Initiation Protocol (SIP).  It changes the usage of the Alert-Info
   header field defined in RFC 3261 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.

Liess, et al.                Standards Track                    [Page 1]
RFC 7462                       Alert URNs                     March 2015

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7462.

Copyright Notice

   Copyright (c) 2015 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   This document may contain material from IETF Documents or IETF
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   Without obtaining an adequate license from the person(s) controlling
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   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Liess, et al.                Standards Track                    [Page 2]
RFC 7462                       Alert URNs                     March 2015

Table of Contents

   1. Introduction ....................................................5
   2. Requirements Language ...........................................7
   3. Terminology .....................................................7
   4. Updates to RFC 3261 .............................................7
      4.1. Allow Alert-Info in Provisional Responses ..................7
      4.2. Proxies May Alter Alert-Info Header Fields .................8
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