Essential service (telecommunications)
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In telecommunication, an essential service (critical service) is a network-provided service feature in which a priority dial tone is furnished. Essential service is typically provided to fewer than 10% of network users, and recommended for use in conjunction with NS/EP telecommunications services.
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This article incorporates public domain material from Federal Standard 1037C. General Services Administration. Archived from the original on 2022-01-22.
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