3GPP SIP URI Inter-Operator Traffic Leg Parameter
RFC 7549

Document Type RFC - Proposed Standard (May 2015; No errata)
Last updated 2015-10-14
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IESG IESG state RFC 7549 (Proposed Standard)
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Internet Engineering Task Force (IETF)                       C. Holmberg
Request for Comments: 7549                                       J. Holm
Category: Standards Track                                       Ericsson
ISSN: 2070-1721                                                R. Jesske
                                                        Deutsche Telekom
                                                                M. Dolly
                                                                    AT&T
                                                                May 2015

           3GPP SIP URI Inter-Operator Traffic Leg Parameter

Abstract

   In 3GPP networks, the signaling path between a calling user and a
   called user can be partitioned into segments, referred to as traffic
   legs.  Each traffic leg may span networks belonging to different
   operators and will have its own characteristics that can be different
   from other traffic legs in the same call.  A traffic leg might be
   associated with multiple SIP dialogs, e.g., in case a Back-to-Back
   User Agent (B2BUA) that modifies the SIP dialog identifier is located
   within the traffic leg.

   This document defines a new SIP URI parameter, 'iotl' (an
   abbreviation for Inter-Operator Traffic Leg).  The parameter can be
   used in a SIP URI to indicate that the entity associated with the
   address, or an entity responsible for the host part of the address,
   represents the end of a specific traffic leg (or multiple traffic
   legs).

   The SIP URI 'iotl' parameter defined in this document has known uses
   in 3GPP networks.  Usage in other networks is also possible.

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/rfc7549.

Holmberg, et al.             Standards Track                    [Page 1]
RFC 7549                       3GPP 'iotl'                      May 2015

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
   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 Simplified BSD License.

Holmberg, et al.             Standards Track                    [Page 2]
RFC 7549                       3GPP 'iotl'                      May 2015

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Conventions . . . . . . . . . . . . . . . . . . . . . . . . .   6
   3.  Applicability . . . . . . . . . . . . . . . . . . . . . . . .   6
   4.  Traffic Leg Examples  . . . . . . . . . . . . . . . . . . . .   6
     4.1.  General . . . . . . . . . . . . . . . . . . . . . . . . .   6
     4.2.  Originating Roaming Call  . . . . . . . . . . . . . . . .   6
     4.3.  Terminating Roaming Call  . . . . . . . . . . . . . . . .   7
     4.4.  Call from Originating Home to Terminating Home  . . . . .   7
   5.  'iotl' SIP URI Parameter  . . . . . . . . . . . . . . . . . .   7
     5.1.  Usage . . . . . . . . . . . . . . . . . . . . . . . . . .   7
     5.2.  Parameter Values  . . . . . . . . . . . . . . . . . . . .   8
       5.2.1.  General . . . . . . . . . . . . . . . . . . . . . . .   8
       5.2.2.  homea-homeb . . . . . . . . . . . . . . . . . . . . .   8
       5.2.3.  homeb-visitedb  . . . . . . . . . . . . . . . . . . .   8
       5.2.4.  visiteda-homea  . . . . . . . . . . . . . . . . . . .   9
       5.2.5.  homea-visiteda  . . . . . . . . . . . . . . . . . . .   9
       5.2.6.  visiteda-homeb  . . . . . . . . . . . . . . . . . . .   9
   6.  Syntax  . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
     6.1.  General . . . . . . . . . . . . . . . . . . . . . . . . .  10
     6.2.  ABNF  . . . . . . . . . . . . . . . . . . . . . . . . . .  10
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
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