| Custom Local Area Signaling Service |
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Custom Local Area Signaling Service (CLASS) is 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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