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When using the HT9032 device to design a caller ID phone for China, why does it fail to display the caller ID when used in Taiwan?

April 26, 2017China design device display fail phone Taiwan Used

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When using the HT9032 device to design a caller ID phone for China, why does it fail to display the caller ID when used in Taiwan?

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Answer The HT9032 is an FSK decoder device, however the system in Taiwan uses DTMF, therefore a DTMF decoded device such as HT9170 should be used to decode the caller’s telephone number.