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3GPP SIP URI Inter-Operator Traffic Leg Parameter (RFC7549) Disclosure Number: IPCOM000241655D
Original Publication Date: 2015-May-01
Included in the Prior Art Database: 2015-May-20
Document File: 34 page(s) / 33K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

C. Holmberg: AUTHOR [+4]


In a 3GPP network, an end-user device can be attached (e.g., using a radio access network) to its own operator network (home network) [TS.3GPP.24.229] or to another operator's network (visited network) [TS.3GPP.24.229]. In the latter case, the user is referred to as a roaming user.

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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


   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

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

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