Chapter 2: Installation
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Avaya one-X Quick Edition Release 2.0.0 Telephone User Guide
July 2006
Extension numbers 400 through 499 are reserved for groups of Telephones and are assigned
manually. Extension numbers 500 through 599 are reserved to invoke Auto Attendant
functionality. Any extension number in the 500 through 599 range can be assigned manually to
a custom Auto Attendant configuration.