Phreaking Wiki
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A magenta box is a device used to simulate an incoming call by applying the AC ringing signal voltage to a POTS line to make the telephones on that line ring. A magenta box in conjunction with an orange box (which emulates the caller ID signal to create falsified Caller ID data) is called a vermilion box.

The magenta box was invented by a phone phreak using the pseudonym Street Fighter.

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