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A hacker sets up a small handheld device that transmits Dual Tone Multi-Frequency (DTMF) and other tones to make free calls from a public pay phone. Which of the following defines this type of attack?

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A hacker sets up a small handheld device that transmits Dual Tone Multi-Frequency (DTMF) and other tones to make free calls from a public pay phone. Which of the following defines this type of attack?






 
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