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https://e2e.ti.com/support/logic-group/logic/f/logic-forum/693417/lm567c-does-lm567c-can-be-use-to-detect-the-status-of-the-landline-telephone
LM567C 是否可用于 检测 座机电话的状态(例如忙、等待应答)并将信息发回给呼叫者。
