A new Request for Comments is now available in online RFC libraries.
RFC 7549
Title: 3GPP SIP URI Inter-Operator Traffic
Leg Parameter
Author: C. Holmberg, J. Holm,
R. Jesske, M. Dolly
Status: Standards Track
Stream: IETF
Date: May 2015
Mailbox: christer.holmberg@ericsson.com,
jan.holm@ericsson.com,
r.jesske@telekom.de,
md3135@att.com
Pages: 17
Characters: 32607
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-holmberg-dispatch-iotl-06.txt
URL: https://www.rfc-editor.org/info/rfc7549
DOI: http://dx.doi.org/10.17487/RFC7549
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).
This is now a Proposed Standard.
STANDARDS TRACK: 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 Official
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