Number RangeFeature/Function
1000-1999Extensions
2000-2999Extensions
3000-3999Extensions
4000-4999Call Queues
5000-5999Call Queues
6000-6999Conferences
7000-7999Call Parks
8000-8999Auto Attendants
9000-9999Auto Attendants

Un-allowed Extension Numbers

The following extension numbers can not be used and are reserved for pre-built system features. If you must use one of these numbers please contact support and a custom dial plan can be created for a minor project fee.

001-009, 411, 700-799, 911, 933, 5000, 5001

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About The Author

President and Co-Founder of Unifying Technologies.