This Stage 1 description of the first phase of Support of Optimal Routing (SOR):
compiles the basic service requirements for SOR;
describes the interactions for Supplementary Services (SS) in order to cater for SOR;
refers to modifications to network features required by SOR.
The purpose of SOR is to reduce the number of unnecessary inter-PLMN call legs.
full Table of Contents for TS 22.079 Word version: 15.0.0