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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: 2014-07-20
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: IESG Evaluation::AD Followup
IANA Action State: None
(Needs a YES. Has a DISCUSS. Has enough positions to pass once DISCUSS positions are resolved.)
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: January 21, 2015                                          Avaya
                                                               D. Worley
                                                              P. Kyzivat
                                                           July 20, 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 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
   all provisional responses to INVITE (except the 100 response).  This
   document also permits proxies to add and remove header field values
   from the Alert-Info header field.

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 January 21, 2015                [Page 1]
Internet-Draft                 Alert URNs                      July 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
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on January 21, 2015.

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   it for publication as an RFC or to translate it into languages other
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Liess, et al.           Expires January 21, 2015                [Page 2]
Internet-Draft                 Alert URNs                      July 2014

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  5
   2.  Requirements Language  . . . . . . . . . . . . . . . . . . . .  7
   3.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  7

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