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2-Digit Numbering Plan
The 2-digit numbering plan is the factory setting. This plan is designed for companies that do not anticipate a need for more than 50 extensions in the next one or two years.
Figure 1 shows the numbers automatically assigned by the system. The numbers in the figure below are arranged in rows according to the first digit. The type of equipment, jack, or feature to which they are assigned is indicated within the row.
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Extension numbers 0 and 10 both refer to the same operator position in the 2-Digit Numbering Plan. |
Each of the first 57 extension jacks defaults to a 2-digit extension number beginning with 10 and ending with 66. The rest of the extensions (extension jacks 67-200) are assigned the 4-digit extension numbers 6700 through 6842.
The extension numbers (710-766) 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 telephone either by using an MFM (such as modems, answering machines, or fax machines) or directly (for example, a terminal adapter). For the first 57 digital extension jacks (numbered 10-66), 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, preceded by a 7. For example, if the extension number assigned to an MLX telephone is 25, the extension number for the MFM adjunct on that telephone is 725. In this example, a call can be made to the telephone by dialing 25, or to the adjunct by dialing 725
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.
Additional extension jacks are shown in See 2-Digit Numbering Plan. as Extra Extensions (6700-6842), and additional extension numbers (4400-Series telephones) and MFMs (MLX telephones) are shown as Extra Adjuncts (6850-6992). If an extra extension is assigned to a 4400-Series or MLX telephone, a second extension number is automatically assigned by the system to the 4400-Series telephone or to the MLX MFM adjunct. The extension number automatically assigned to the 4400-Series telephone or MLX MFM adjunct is the original extension number assigned to the 4400-Series or MLX telephone, increased by 150. For example, if the extension number assigned to an MLX telephone is 6700, the extension number for the MFM adjunct on that telephone is 6850. In this example, a call can be made to the telephone by dialing 6700, or to the MFM adjunct by dialing 6850.
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