Technique for interconnecting circuit-switched and packet-switched domains
First Claim
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1. An application server for providing circuit-switched (CS) services for a call, the application server comprising:
- a first Interface for receiving Packet Switched (PS) protocol messages requesting CS services for a call stretching between a PS domain and a CS domain through an Internet protocol multimedia subsystem (IMS) domain;
a service component for providing the requested CS services for the call;
a second interface (BICC/ISUP), configured as an integrated services digital network user part (ISUP) interface and a bearer independent call control (BICC) interface, for passing call control towards the CS domain after the CS services have been provided; and
decision logic for deciding if call control is to be passed back via the first interface or if call control is to be passed via the second interface towards the CS domain,wherein the application server is an IMS server, which includes a microprocessor, executing stored instructions in an associated non-transitory memory to directly pass the call control to the CS domain at an application layer.
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Abstract
A technique for providing circuit-switched call services for a call stretching between a packet-switched domain and circuit-switched domain is provided. A possible server implementation of this technique includes a first interface adapted to receive packet-switched protocol messages requesting circuit-switched call services, a service component providing the requested call services, and a second interface adapted to pass call control towards the circuit-switched domain after the call services have been provided.
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Citations
16 Claims
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1. An application server for providing circuit-switched (CS) services for a call, the application server comprising:
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a first Interface for receiving Packet Switched (PS) protocol messages requesting CS services for a call stretching between a PS domain and a CS domain through an Internet protocol multimedia subsystem (IMS) domain; a service component for providing the requested CS services for the call; a second interface (BICC/ISUP), configured as an integrated services digital network user part (ISUP) interface and a bearer independent call control (BICC) interface, for passing call control towards the CS domain after the CS services have been provided; and decision logic for deciding if call control is to be passed back via the first interface or if call control is to be passed via the second interface towards the CS domain, wherein the application server is an IMS server, which includes a microprocessor, executing stored instructions in an associated non-transitory memory to directly pass the call control to the CS domain at an application layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An Internet protocol multimedia subsystem (IMS) comprising an application server for providing circuit-switched (CS) services for a call, the application server comprising:
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a first Interface for receiving Packet Switched (PS) protocol messages that are requesting CS services for a call stretching between a packet-switched PS-domain and a CS domain through an Internet protocol multimedia subsystem (IMS) domain; a service component configured to provide the requested CS services for the call; a second interface (BICC /ISUP), configured as an integrated services digital network user part (ISUP) interface and a bearer independent call control (BICC) interface, for providing call control towards the CS domain after the CS services have been provided; and decision logic for deciding if call control is to be passed back via the first interface or if call control is to be passed via the second interface towards the CS domain, wherein the application server is an IMS server comprising a microprocessor executing instructions stored in an associated non-transitory memory to directly pass the call control to the CS domain at an application layer. - View Dependent Claims (10)
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11. A method of providing circuit-switched (CS) services for a call in an application server of an Internet protocol multimedia subsystem (IMS), the method comprising the steps of:
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receiving packet switched (PS) protocol messages requesting CS services for a call stretching between a packet-switched domain and a CS domain through the IMS; providing the requested CS services for the call; and deciding if call control is to be passed back to a component in the PS domain or if call control is to be passed towards the CS domain; if call control is to be passed towards the CS domain, passing call control, via an interface (BICC /ISUP) configured as an integrated services digital network user part (ISUP) interface and a bearer independent call control (BICC) interface, to the CS domain after the CS services have been provided, wherein the call control is passed directly from the application server to the CS domain at an application layer. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification