Call handling for IMS registered user
AssigneeTelefonaktiebolaget L M Ericsson (publ)
InventorsAndreas Witzel, Ralf Keller
Life of this patent
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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.
Claims12
A Mobile Access Gateway Function (MAGCF) node adapted to handle a call in a packet-based multimedia system domain for a circuit-switched controlled user's terminal located in circuit-switched controlled domain and being registered in the packet-based multimedia system wherein said MAGCF node, an anchor point for the handled call, comprises a microprocessor coupled to a persistent memory storing instructions that, when executed by the microprocessor enable the MAGCF to:
- receive an originating circuit switched call from a serving Mobile Switching Center (MSC) by using a routing number to route the originating circuit switched call from the serving MSC to the MAGCF node and,
- send an originating packet-based multimedia call via a proxy call control function (P-CSCF) being part of the MAGCF node towards the packet based multimedia domain, and
- receive from the packet-based multimedia domain a terminating packet-based multimedia call being addressed to the P-CSCF that is part of the MAGCF node, and
- send a terminating circuit-switched call towards the circuit-switched controlled user's terminal via the serving MSC, and
- convert the originating circuit-switched call into the originating packet-based multimedia call by starting a packet-based call setup procedure, and to convert the terminating packet-based multimedia call into the terminating circuit-switched call by initiating a circuit-switched call setup procedure,
- wherein said MAGCF node comprises a registration logic adapted to perform a registration procedure for registering the circuited-switched controlled user's terminal into the packet-based multimedia domain, wherein said registration procedure results in storing an address of a serving packet-based multimedia node in the MAGCF node and in providing an address of the P-CSCF that is part of the MAGCF node to the serving packet-based multimedia node, and
- wherein the serving MSC is located in a visited network into which the circuit-switched controlled user's terminal has roamed.
A method for handling a call for a circuit-switched controlled user's terminal located in circuit switched controlled domain and being registered in the packet-based multimedia system wherein said call is to be handled in a packet-based multimedia domain with a Mobile Access Gateway Function (MAGCF) node, wherein said MAGCF node is an anchor point for the handled call, the MAGCF node comprising a microprocessor coupled to a persistent memory storing instructions that, when executed by the microprocessor cause the MAGCF node to perform the following steps:
- performing a registering procedure for registering the circuited-switched controlled user's terminal into the packet-based multimedia domain, the registering procedure comprising:
- storing an address of a serving packet-based multimedia node in the MAGCF node;
- and
- providing an address of a proxy call control function (P-CSCF), integrated with the MAGCF node and being a contact point of the packet-based multimedia system, to the serving packet-based multimedia node;
- performing a call originating procedure comprising:
- receiving an originating circuit-switched call from a serving Mobile Switching Center (MSC), serving the circuit-switched controlled user's terminal and located in a visited network into which the circuit-switched controlled user's terminal has roamed, by using a routing number to route the originating circuit-switched call from the serving MSC to the MAGCF node;
- converting the originating circuit-switched call into an originating packet-based multimedia call;
- and
- sending the originating packet-based multimedia call via the P-CSCF towards the packet-based multimedia domain;
- 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 P-CSCF;
- converting the terminating packet-based multimedia call into a terminating circuit-switched call;
- and
- sending the terminating circuit-switched call towards the circuit-switched controlled user's terminal via the serving MSC.
Dependencies are inferred from the claim text.