Which of the following is a method of out-of-band signaling developed by AT&T in the 1970s?
A) Codec
B) Cell
C) Circuit switching
D) Common Channel Signaling

Question

Quizplus · Accepted Answer

Common Channel Signaling (CCS) is a method of out-of-band signaling where the control and management of telephone calls are handled on a separate channel rather than within the same channel as the call itself. This method was indeed developed by AT&T in the 1970s to improve the efficiency and capabilities of the telephone network.

Which of the Following Is a Method of Out-Of-Band Signaling