Requirements for SIP-Based Session Peering
RFC 6271

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Internet Engineering Task Force (IETF)                         J-F. Mule
Request for Comments: 6271                                     CableLabs
Category: Informational                                        June 2011
ISSN: 2070-1721

               Requirements for SIP-Based Session Peering

Abstract

   This memo captures protocol requirements to enable session peering of
   voice, presence, instant messaging, and other types of multimedia
   traffic.  This informational document is intended to link the various
   use cases described for session peering to protocol solutions.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   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).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see 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/rfc6271.

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
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   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.

Mule                          Informational                     [Page 1]
RFC 6271            SIP Session Peering Requirements           June 2011

Table of Contents

   1. Introduction ....................................................2
   2. Terminology .....................................................3
   3. General Requirements ............................................3
      3.1. Scope ......................................................4
      3.2. Border Elements ............................................4
      3.3. Session Establishment Data .................................8
           3.3.1. User Identities and SIP URIs ........................8
           3.3.2. URI Reachability ....................................9
   4. Requirements for Session Peering of Presence and
      Instant Messaging ..............................................10
   5. Security Considerations ........................................12
      5.1. Security Properties for the Acquisition of Session
           Establishment Data ........................................12
      5.2. Security Properties for the SIP Signaling Exchanges .......13
      5.3. End-to-End Media Security .................................14
   6. Acknowledgments ................................................15
   7. References .....................................................15
      7.1. Normative References ......................................15
      7.2. Informative References ....................................15
   Appendix A. Policy Parameters for Session Peering .................19
     A.1. Categories of Parameters for VoIP Session Peering and
          Justifications .............................................19
     A.2. Summary of Parameters for Consideration in Session
          Peering Policies ...........................................22

1.  Introduction

   Peering at the session level represents an agreement between parties
   to exchange multimedia traffic.  In this document, we assume that the
   Session Initiation Protocol (SIP) is used to establish sessions
   between SIP Service Providers (SSPs).  SIP Service Providers are
   referred to as peers, and they are typically represented by users,
   user groups, enterprises, real-time collaboration service
   communities, or other service providers offering voice or multimedia
   services using SIP.

   A number of documents have been developed to provide background
   information about SIP session peering.  It is expected that the
   reader is familiar with the reference architecture described in
   [ARCHITECTURE], use cases for voice ([VOIP]), and instant messaging
   and presence ([RFC5344]).

Mule                          Informational                     [Page 2]
RFC 6271            SIP Session Peering Requirements           June 2011

   Peering at the session layer can be achieved on a bilateral basis
   (direct peering established directly between two SSPs), or on an
   indirect basis via a session intermediary (indirect peering via a