Instruction manual

The 4400-Series Telephone Family
3-6
Installation, SPM, Maintenance, and Troubleshooting Supplement
4424D+ 3
All 24 line buttons on the 4424D+ telephone have associated LEDs. You can
use the four softkeys to choose options from the two-line display in the same
way you choose options with the MLX-28D telephone.
Besides the softkeys, the 4424D+ telephone has the following fixed buttons:
■ Volume
■ Hold
■ Conf (Conference)
■ Trnsfr (Transfer)
■ Redial
■ Spkr (Speaker)
■ Mute
■ Menu
■
■
■
Exit
The 4424D+ telephone can be a Direct-Line Console and can have one or two
DSS4450s attached to it.
An Auxiliary Power Supply Unit is required and is not automatically
shipped when you connect one or two DSS4450s to a 4424D+
telephone. You must order the Auxiliary Power Supply separately.