Directory Numbers

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System Availability: All systems

A Directory Number [DN], sometimes called an “extension number,” is the number someone must call to reach a destination within the system. Each [DN] is assigned to a flexible button on a digital telephone or as the main directory number of a standard telephone. To maximize call coverage flexibility any [DN] can appear on multiple telephones. Also, individual telephones can have multiple [DN] buttons with different Directory Numbers.

The system provides Primary and Phantom [DN] buttons on telephones. All [DN] buttons can be used to originate and answer calls.

 


























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