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METHOD FOR IMPROVED HANDLING OF IP MULTIMEDIA SUBSYSTEM CALLS IN A HOME MOBILE COMMUNICATION NETWORK AND A VISITED MOBILE COMMUNICATION NETWORK
METHOD FOR IMPROVED HANDLING OF IP MULTIMEDIA SUBSYSTEM CALLS IN A HOME MOBILE COMMUNICATION NETWORK AND A VISITED MOBILE COMMUNICATION NETWORK
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机译：改进家庭移动通信网络中IP多媒体子系统调用的方法和访问的移动通信网络的方法
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摘要
The invention relates to a method for improved handling of IP multimedia subsystem calls and configuration of a user equipment using a home mobile communication network in the situation that either - the user equipment attempts or is able to attempt an IP multimedia subsystem emergency call or a IP multimedia subsystem call, and the user equipment being connected to a visited mobile communication network via a radio access network of or associated with the visited mobile communication network, or - the user equipment attempts or is able to attempt an IP multimedia subsystem emergency call, the user equipment being connected to the home mobile communication network via a radio access network of or associated with the home mobile communication network, wherein the method comprises the following steps: - in a first step, an IP multimedia subsystem call parameter information or an IP multimedia subsystem emergency call parameter information is transmitted by the visited mobile communication network to the user equipment in case that the user equipment is connected to the visited mobile communication network, or an IP multimedia subsystem emergency call parameter information is transmitted by the home mobile communication network to the user equipment in case that the user equipment is connected to the home mobile communication network, - in a second step, during or subsequent to the first step, the user equipment –upon attempting an IP multimedia subsystem emergency call and/or an IP multimedia subsystem call –applies or acts according to the content of the IP multimedia subsystem call parameter information and/or of the IP multimedia subsystem emergency call parameter information.
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