Although the EU24BL Expansion Module supports an additional 24 Call Appearance/Feature buttons, it displays only the button labels for one column of 12 buttons at a time. A dotted line separates the left column from the right column. When you view the labels and icons for the left column, the icons for any active or selected right column features display to the right of the dotted line. To view the column not currently displayed, press the Alternate Display button. You can alternately press any Call Appearance/Feature button on the column not currently displayed. Doing so displays that column and selects the line/feature associated with the button you pressed.

For systems where phone add-ons are being used, IP Office 3.1 supports a maximum of eight EU24 and or EU24BL per system. Alternatively it supports two XM24 or two 4450 units on each module with DS ports including the control unit.

• 24 Programmable call appearance/feature keys.

• Automatically labeled from the system (no paper labels).

• Connects directly to the associated phone.

• Requires a 1151B1 or 1151B2 power supply unit for the phone including for IP phones using Power over Ethernet (PoE).

• Use the EU24BL with these Avaya telephones:

• • 4621SW IP Telephone.

  • 4620SW IP Telephone.

  • 5620SW IP Telephone.