Patent ID: 9509547
Filing Date: 2016-11-29
CPC Classification: H04L,H04W

Claim Text:
1. A method of using Internet Protocol Multimedia Subsystem (IMS) Centralised Services (ICS) in a selection of a service domain on a terminating side of a call originated by an originating side User Equipment (UE) to a terminating side UE being served by a Circuit Switched (CS) access network, the method comprising: receiving, in the terminating UE's CS access network, a call set-up message from the originating UE; sending a request to a Service Domain Selection (SDS) function for selection of a service domain for the call to determine when the call should be routed in an IMS service domain or in a CS service domain; receiving a service domain selection indication from the SDS function; responsive to sending the request to the SDS function and a determination that the call should be routed in the CS service domain, receiving CS service data including instructions for the processing of call events in the CS domain; and based on the received selection indication, routing the call either via the IMS service domain or directly to the terminating UE via the CS service domain, wherein: