Feature Group
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Feature Groups are switching arrangements between Local exchange carriers central offices to interexchange carriers.
Such an arrangement allows the LEC's end users to make (long distance) phone calls using the interexchange carrier's network.
These arrangements are described in an official tariff of the National Exchange Carrier Association that is filed with the FCC.
The following 4 feature groups exist:
- Feature Group A - user has to dial a local telephone number, following by the desired long-distance number.
- Feature Group B - associated with 950-XXXX calling; instead of a local telephone number the user enters 950 and 4 additional digits, followed by the long-distance number
- Feature Group C - used mainly by AT&T
- Feature Group D - highest quality connection, and allows pre-selection of the interexchange carrier by the end-user. The end-user therefore doesn't have to select any prefix to use this service.
