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Custom local area signaling service

Custom local area signaling service (CLASS): One of an identified group of network-provided enhanced services.

Note: A CLASS group for a given network usually includes several enhanced service offerings, such as incoming-call identification, call trace, call blocking, automatic return of the most recent incoming call, call redial, and selective forwarding and programming to permit distinctive ringing for incoming calls.

Source: from Federal Standard 1037C

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