3GPP SIP URI Inter-Operator Traffic Leg Parameter
2015
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).
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