Hacking Question:

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What is a Blue Box?

Hacking Interview Question
Hacking Interview Question

Answer:

Blue boxes use a 2600hz tone to convince telephone switches that use
in-band signalling that the caller is actually a telephone operator.
The caller may then access special switch functions, with the usual
purpose of making free long distance phone calls, using the
Multi-Frequency tones provided by the Blue Box.

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