| 摘要 |
The apparatus comprises a central processing unit, a central processing unit resetting unit, power, a sound transmission/reception unit, a call circuit switching unit, a first sound combining unit, a loop sensing unit, a signal tone generating unit, a DTMF signal receiving unit, a data transmission/reception unit, a data transmission unit, a data comparison unit, a second sound combining unit, a call signal generating unit, and an outputting unit.
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