Many analog devices are pre-configured for use in the USA, and do not understand the call progress tones of your country.
许多模拟设备的预配置用于在美国，不明白你的国家的呼叫进程音。
Many analog devices are pre-configured for use in the USA, and do not understand the call progress tones of your country.
许多模拟设备的预配置用于在美国，不明白你的国家的呼叫进程音。
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