Call handling for IMS registered user
AssigneeTelefonaktiebolaget L M Ericsson (publ)
InventorsAndreas Witzel, Ralf Keller
Life of this patent
Estimating the term…
Abstract
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.
Claims17
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.
A method for handling a call for a circuit-switch controlled user's terminal located in a circuit-switch controlled domain of a visited network, wherein said call is to be handled in a packet-based multimedia domain of an Access Gateway Node in a home network of the circuit-switched controlled user's terminal, the method comprising:
- performing a call originating procedure comprising:
- receiving an originating circuit-switched call from the circuit-switch controlled user's terminal via a serving Mobile Switching Center (MSC) in the visited network;
- converting the originating circuit-switched call into an originating packet-based multimedia call;
- and
- sending, using SIP, the originating packet-based multimedia call via an integrated proxy call session control function towards a S-CSCF of the packet-based multimedia 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;
- and
- performing a call terminating procedure comprising:
- receiving from the packet-based multimedia domain a terminating packet-based multimedia call being addressed to the integrated proxy call session control function, 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;
- converting the terminating packet-based multimedia call into a terminating circuit-switched call;
- and
- sending the terminating circuit-switched call towards the circuit-switch controlled user's terminal via the serving MSC in the visited network.
Dependencies are inferred from the claim text.