Patent ID: 9544338
Date: 2017-01-10
CPC Classifications: H04L

Claim:
1. An Access Gateway Node in a home network of a circuit-switched controlled user's terminal (MS) adapted to handle a call in a packet-based multimedia system domain for the circuit-switched controlled user's terminal located in a circuit-switched controlled domain of a visited network, 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, via a serving Mobile Switching Center (MSC) in the visited network, at an originating circuit switched logic; send, using SIP, 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 a S-CSCF of the packet-based multimedia system domain, wherein the S-CSCF is adapted to serve the user in the IMS domain and is determined by the Access Gateway Node during a registration procedure of the circuit-switched controlled user's terminal and wherein the Access Gateway Node knows an address of the S-CSCF based on the registration of the circuit-switched controlled user's terminal; 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, wherein the call is received from the S-CSCF determined during the registration procedure of the circuit-switched controlled user's terminal and wherein the S-CSCF knows an address of the Access Gateway Node based on the registration procedure of the circuit-switched controlled user's terminal; send a terminating circuit-switched call from a terminating circuit-switched logic towards the circuit-switch controlled user's terminal via the serving MSC in the visited network; 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.