Three-Digit Numbering Plan - AT&T MERLIN LEGEND System Reference Manual

Features

Three-Digit Numbering Plan

Figure 2-20
A = 800 - Listed Directory Number (QCC Queue)
B = 889 - Remote Access
2-362 System Numbering
The extension numbers shown for MFMs/7500B Data Modules (710-767) are
reserved for digital station jacks. These numbers are automatically assigned by
the system to ISDN 7500B Data Modules or to adjuncts (such as a data terminal,
answering machine, or fax) connected to an MLX telephone using a Multi-
Function Module (MFM). For the first 58 digital station jacks, the extension
number assigned to the adjunct is the extension number assigned to the MLX
telephone preceded by a 7. For example, if the extension assigned to an MLX
telephone is 25, the extension for the 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.
Note: The extension numbers are reserved whether or not an adjunct is
connected. to an MLX telephone. If you reassign the extension number of the
telephone, the system does not automatically change the extension of the MFM
or data module.
The Three-Digit numbering plan is designed for businesses with more than 50
stations. Figure 2-20 shows the numbers automatically assigned by the system
when you renumber the system with this plan.
Three-Digit Numbering Plan
All stations are assigned a three-digit extension number beginning with 100 and
ending with 243.