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| 터치톤 인터페이스 (An interface that is used to navigate the menus of a Unified Messaging (UM) system using DTMF or touchtone inputs) | |||
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| 터치톤 인터페이스 (An interface that is used to navigate the menus of a Unified Messaging (UM) system using DTMF or touchtone inputs) | |||
