What is a Black Box?
A Black Box is a resistor (and often capacitor in parallel) placed in series across a telephone line to cause the telephone company equipment to be unable to detect that the telephone line has been answered.
People who call the line which has the black box installed will not be billed for the telephone call.
Black boxes worked under telephone systems that used Common Channel Signaling. Black boxes do not work under modern ESS (Electronic Switching System).
|
|
|
Bookmark What is a Black Box?
Free White Papers on Telephony
