Which term does not match the others: Common Channel Signaling, Signaling System 7, Integrated Services Digital Network?

The correct choice is based on the classification of signaling types. Common Channel Signaling, Signaling System 7, and Integrated Services Digital Network are all associated with digital signaling methodologies used for telecommunications.

Common Channel Signaling refers to a method of signaling where a dedicated channel is used exclusively for signaling purposes, independent of the voice or data channels. It is commonly used to set up and manage calls between switches in digital networks.

Signaling System 7 (SS7) is a specific protocol suite used for signaling in telephone networks. It enables features such as call setup, routing, and management of telephone calls over digital networks, closely aligning with Common Channel Signaling principles.

Integrated Services Digital Network (ISDN) is a set of communication standards that enables the transmission of voice, video, and data over traditional circuits of the public switched telephone network. ISDN uses digital signaling to facilitate these services.

In contrast, the term Analog Signaling refers to the older method of transmitting voice and data using analog signals, which is fundamentally different from the digital signaling concepts represented by the other terms. Therefore, Analog Signaling does not match the others, as it pertains to a different category of signaling technology.