Registration for Multiple Phone Numbers in the Session Initiation Protocol (SIP)
RFC 6140

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Internet Engineering Task Force (IETF)                        A.B. Roach
Request for Comments: 6140                                       Tekelec
Updates: 3680                                                 March 2011
Category: Standards Track
ISSN: 2070-1721

                Registration for Multiple Phone Numbers
                in the Session Initiation Protocol (SIP)

Abstract

   This document defines a mechanism by which a Session Initiation
   Protocol (SIP) server acting as a traditional Private Branch Exchange
   (PBX) can register with a SIP Service Provider (SSP) to receive phone
   calls for SIP User Agents (UAs).  In order to function properly, this
   mechanism requires that each of the Addresses of Record (AORs)
   registered in bulk map to a unique set of contacts.  This requirement
   is satisfied by AORs representing phone numbers regardless of the
   domain, since phone numbers are fully qualified and globally unique.
   This document therefore focuses on this use case.

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/rfc6140.

Copyright Notice

   Copyright (c) 2011 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

Roach                        Standards Track                    [Page 1]
RFC 6140          Globally Identifiable Number Routing        March 2011

   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 Simplified BSD License.

Table of Contents

   1. Introduction ....................................................3
   2. Constraints .....................................................3
   3. Terminology and Conventions .....................................4
   4. Mechanism Overview ..............................................5
   5. Registering for Multiple Phone Numbers ..........................5
      5.1. SIP-PBX Behavior ...........................................5
      5.2. Registrar Behavior .........................................6
      5.3. SIP URI "user" Parameter Handling ..........................8
   6. SSP Processing of Inbound Requests ..............................8
   7. Interaction with Other Mechanisms ...............................9
      7.1. Globally Routable User Agent URIs (GRUU) ...................9
           7.1.1. Public GRUUs ........................................9
           7.1.2. Temporary GRUUs ....................................11
      7.2. Registration Event Package ................................16
           7.2.1. SIP-PBX Aggregate Registration State ...............16
           7.2.2. Individual AOR Registration State ..................16
      7.3. Client-Initiated (Outbound) Connections ...................18
      7.4. Non-Adjacent Contact Registration (Path) and
           Service-Route Discovery ...................................19
   8. Examples .......................................................20
      8.1. Usage Scenario: Basic Registration ........................20
      8.2. Usage Scenario: Using Path to Control Request URI .........22
   9. IANA Considerations ............................................24
      9.1. New SIP Option Tag ........................................24
      9.2. New SIP URI Parameters ....................................25
           9.2.1. 'bnc' SIP URI Parameter ............................25
           9.2.2. 'sg' SIP URI Parameter .............................25
      9.3. New SIP Header Field Parameter ............................25
   10. Security Considerations .......................................25
   11. Acknowledgements ..............................................28
   12. References ....................................................28
      12.1. Normative References .....................................28
      12.2. Informative References ...................................29
   Appendix A. Requirements Analysis .................................31

Roach                        Standards Track                    [Page 2]