This invention provides a network node for IP Multimedia Subsystem (IMS) Centralized Services (ICS), comprising: a memory storing instructions; and at least one processor configured to process the instructions to: receive an Update Location Request with an IMSI (International Mobility Subscriber Identity) and an MSRN (Mobile Station Routing Number) from a MSC (Mobile Switching Centre) Server, retrieve a subscription profile and service settings from a HSS (Home Subscriber Server), map the subscription profile with service settings into a CS (Circuit-Switched) profile with CS settings, and send an Insert Subscriber Data message including the mapped CS profile and CS settings, to the MSC Server.