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This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these messages) This article relies largely or entirely on a single source. Relevant discussion may be found on the talk page. Please help improve this article by introducing citations to additional sources. Find sources: "Essential service" telecommunications – news · newspapers · books · scholar · JSTOR (November 2020) This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations. Please help improve this article by introducing more precise citations. (November 2020) (Learn how and when to remove this message) (Learn how and when to remove this message)

In telecommunications, 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.

References

•  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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