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Registration Event Package Extension for Session Initiation Protocol (SIP) Globally Routable User Agent URIs (GRUUs)
RFC 5628

Network Working Group                                         P. Kyzivat
Request for Comments: 5628                           Cisco Systems, Inc.
Category: Standards Track                                   October 2009

               Registration Event Package Extension for
                   Session Initiation Protocol (SIP)
               Globally Routable User Agent URIs (GRUUs)

Abstract

   RFC 3680 defines a Session Initiation Protocol (SIP) event package
   for registration state.  This package allows a watcher to learn about
   information stored by a SIP registrar, including its registered
   contact.

   However, the registered contact is frequently unreachable and thus
   not useful for watchers.  The Globally Routable User Agent URI
   (GRUU), defined in RFC 5627, is a URI that is capable of reaching a
   particular contact.  However this URI is not included in the document
   format defined in RFC 3680.  This specification defines an extension
   to the registration event package to include GRUUs assigned by the
   registrar.

Status of This Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (c) 2009 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
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the BSD License.

Kyzivat                     Standards Track                     [Page 1]
RFC 5628                Reg Event GRUU Extension            October 2009

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   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.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  4
   3.  Description  . . . . . . . . . . . . . . . . . . . . . . . . .  4
   4.  Notifier Processing of SUBSCRIBE Requests  . . . . . . . . . .  4
   5.  Notifier Generation of NOTIFY Requests . . . . . . . . . . . .  4
   6.  Subscriber Processing of NOTIFY Requests . . . . . . . . . . .  5
     6.1.  Managing Temporary GRUU Lifetime . . . . . . . . . . . . .  5
   7.  Sample reginfo Document  . . . . . . . . . . . . . . . . . . .  7
   8.  Examples . . . . . . . . . . . . . . . . . . . . . . . . . . .  7
     8.1.  Example: Welcome Notice  . . . . . . . . . . . . . . . . .  8
     8.2.  Example: Implicit Registration . . . . . . . . . . . . . .  8
   9.  XML Schema Definition  . . . . . . . . . . . . . . . . . . . . 11
   10. IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 12
     10.1. URN Sub-Namespace Registration . . . . . . . . . . . . . . 12
     10.2. XML Schema Registration  . . . . . . . . . . . . . . . . . 13
   11. Security Considerations  . . . . . . . . . . . . . . . . . . . 13
   12. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 14
   13. References . . . . . . . . . . . . . . . . . . . . . . . . . . 14
     13.1. Normative References . . . . . . . . . . . . . . . . . . . 14
     13.2. Informative References . . . . . . . . . . . . . . . . . . 14

Kyzivat                     Standards Track                     [Page 2]
RFC 5628                Reg Event GRUU Extension            October 2009

1.  Introduction

   RFC 3680 [2] defines a Session Initiation Protocol (SIP) [5] event
   package for registration state.  This package allows a watcher to

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