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Forbidden Extension Numbers

Certain extension numbers are restricted due to potential conflicts with 911 services and the increased risk of misdials.

Updated November 5, 20261 min read

The following extensions are not permitted:

000, 211, 311, 411, 611, 711, 811, 911, 933, 999

When creating or deploying a customer, an error message will appear if an attempt is made to assign any of these restricted extensions.

See FCC for more information.

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