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METHOD AND APPARATUS FOR INFORMING CSI UE WHICH CAN COMMUNICATE WITH VOIP UE WHETHER CSI UE CAN USE CS SERVICE OR NOT
METHOD AND APPARATUS FOR INFORMING CSI UE WHICH CAN COMMUNICATE WITH VOIP UE WHETHER CSI UE CAN USE CS SERVICE OR NOT
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机译：通知CSI UE可以与VOIP UE通信的方法和装置，无论CSI UE是否可以使用CS服务
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摘要
A method and a system for informing an application server whether a CSI(Combined CS call and IMS(IP Multimedia Subsystem) session) terminal, which can communicate with a VoIP terminal, can use a CS(Circuit Switched) service are provided to enable an application server, receiving a call request which includes a real-time service through an IMS domain from a VoIP terminal, to flexibly process the real-time service according to the present network of a CSI terminal so that the CSI terminal can smoothly communicate with the VoIP terminal even in a specific network where a CS domain is not available. After registration for an IMS domain, a CSI terminal receives a subscription message from an application server(402,404). Based on the subscription message, the CSI terminal confirms an available domain at the present location, and judges whether the confirmed CS domain can be used(406,408). In case the CS domain cannot be used, the CSI terminal transmits a response message to inform the application server that it is impossible to use the CS domain. Then, under control of the application server, the CSI terminal executes both real-time services and non-real time services by using IMS sessions(412).
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