Custom local area signaling services (CLASS) features offered by local telephone companies are dependent on the SS-7 signaling network and are offered only if the switch is SS-7 capable.

Question

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CLASS features, such as caller ID, call blocking, and call waiting, rely on the advanced capabilities of the SS-7 (Signaling System No. 7) network to function. If a telephone switch is not SS-7 capable, it cannot support these features.

Custom Local Area Signaling Services (CLASS) Features Offered by Local