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Incumbent local exchange carrier

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What is a CLEC? (Competitive Local Exchange Carrier)

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Incumbent local exchange Carrier

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Senior 1 (ILEC CE)

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Youth Class (ILEC CE)

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Upper Intermediate B (ILEC CE)

An incumbent local exchange carrier (ILEC) is a local telephone company which held the regional monopoly on landline service before the market was opened to competitive local exchange carriers, or the corporate successor of such a firm. In much of the United States, these were originally Bell System companies, although various regional independents in the US held incumbent monopolies in their respective regions.
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