© 2018 Metaswitch Networks. All Rights Reserved www .me t aswit ch. c om Service-layer evolution decoupled from subscriber migration Keep existing legacy services Enable IMS subscribers to use existing services IM-SSF legacy subscribers IMS subscribers Enable Legacy subscribers to access new services R-IM-SSF Add new services in IMS Polkomtel (Plus) Case Study Reduce the costs and stimulate innovation by accelerating the evolution of their network and service layer to All-IP . Business Objective • Enable GSM users to access new IP hosted services despite there being no standards based solution to support this • Enable IP connected users to use profitable IN services without incurring high costs and long delays through re- creating duplicate services within the IMS domain • Avoid t

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