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ETSI TS 123 079
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ETSI TS 123 079 Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); Support of Optimal Routeing (SOR); Technical realization (3GPP TS 23.079 version 14.0.0 Release 14)
standard by European Telecommunications Standards Institute, 04/01/2017
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Full Description
ETSI TS 123 079 specifies the technical realisation of the first phase of the network feature Support of OptimalRouteing (SOR). The first phase of SOR provides: as a network operator option, a method to route a call from one mobile subscriber directly to another mobilesubscriber who is in the same country as the calling mobile subscriber or in the called mobile subscriber's homecountry, without needing to connect the call via the HPLMN of the called subscriber, even though the calledmobile subscriber has roamed outside his HPLMN; a method to forward calls when a called mobile subscriber who has roamed outside his home country is busy, oris not reachable, or does not reply, to a forwarded-to destination in the HPLMN country of the called subscriberor the VPLMN country of the called subscriber, without needing to connect the forwarded call via the VPLMNof the called subscriber; a method to combine the optimal routeing described in the first bullet point above with the optimal routeingdescribed in the second bullet point above.OR of a call is permitted only if all entities involved in handling the call support OR.Other cases of optimal routeing (e.g. calls where the calling and called subscribers are in different countries, forwardingto a mobile subscriber or multiple forwarding) will be considered for inclusion in later phases.