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3-Digit Numbering Plan
The 3-digit numbering plan is designed for companies with more than 50 extensions. The figure below shows the numbers automatically assigned by the system when you renumber the system using the 3-digit numbering plan.
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Extension numbers 0 and 100 both refer to the same operator position in the 3-digit numbering plan. |
Extensions default to 3-digit extension numbers beginning with 100 and ending with 299.
The extension numbers (300-499) shown for Adjuncts are reserved for TDL and MLX extension jacks. When the extension jack is connected to a 4400-Series telephone, one of these numbers is automatically assigned by the system as a second extension number. When the extension jack is connected to an MLX telephone, one of these extension numbers is automatically assigned by the system to the adjunct connected to the telephone. The adjunct is connected to the MLX telephone either by using an MFM (such as modems, answering machines, or fax machines) or directly (for example, a terminal adapter). The extension number assigned as a second extension number (4400-Series telephone) or to the adjunct (MLX telephone) is the extension number assigned to the 4400-Series or MLX telephone, increased by 200. For example, if the extension number assigned to an MLX telephone is 125, the extension number for the MFM adjunct on that telephone is 325. In this example, a call can be made to the telephone by dialing 125 , or to the adjunct by dialing 325.
Because the 4400-Series telephone uses only one extension number, you can use the automatically assigned second extension number as a phantom extension number for providing coverage.
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