Call Handling for IMS registered user

摘要

The present invention proposes a solution for providing IMS services to users having circuit-switched controlled terminals. In particular, it is proposed, in order to allow IMS to take the full call and service control, to combine circuit-switched and packet-based multimedia functionality in a new node type called Mobile Access Gateway Control Function (MAGCF). In particular the present invention provides a method for ensuring that the MAGCF node acts as a roaming anchor point in order to enforce the handling of originating and terminating calls in the IMS.

主权项

1. An Access Gateway Node adapted to handle a call in a packet-based multimedia system domain for a circuit-switched controlled user's terminal located in a circuit-switched controlled domain wherein said Access Gateway Node comprises a microprocessor coupled to a memory storing instructions that, when executed by the microprocessor, enable the Access Gateway Node to:
receive an originating circuit-switched call from the circuit-switch controlled user's terminal at an originating circuit switched logic; send an originating packet-based multimedia call from an originating packet-based multimedia logic via a proxy call session control function being part of the Access Gateway Node towards the packet-based multimedia system domain; receive a terminating packet-based multimedia call from the packet-based multimedia domain, the terminating packet-based multimedia call being addressed to the proxy call session control function being part of the Access Gateway Node and being at a terminating packet-based multimedia logic; send a terminating circuit-switched call from a terminating circuit-switched logic towards the circuit-switch controlled user's terminal; and convert the originating circuit-switched call into the originating packet-based multimedia call and convert the terminating packet-based multimedia call into the terminating circuit-switched call by using a conversion function.