Blue box

An early phreaking tool, the blue box is an electronic device that simulates a telephone operator's dialing console. It functions by replicating the tones used to switch long-distance calls and using them to route the user's own call, bypassing the normal switching mechanism. The most typical use of a blue box was to get free telephone calls. Blue boxes no longer work in most western nations, as the switching system is now digital and no longer uses inband signaling. Instead, signaling occurs on an out-of-band channel which cannot be accessed from the line you are using (called Common Channel Interoffice Signaling (CCIS)).

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Phreaking: Phreaking is a slang term coined to describe the activity of a subculture of people who study, experiment with, or exploit telephones, the telephone company, and systems connected to or composing the Public Switched Telephone Network (PSTN) for the purposes of hobby or utility. The term "phreak" is...

Electronic device: REDIRECT Electronics...

Common Channel Interoffice Signaling: REDIRECT Common Channel Signaling...

Blue box related Images and Photos (experimental)

Ghostbusters Box of Puft Light Blue T-Shirt	Blue	BLUE	Blue
Box, The (DVD)	Blue I	Blue Sun	Blue Boy
Blue III	Blue Cat	Blue Sky	Blue Ice (DVD)