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The Feature Key Expansion Unit is an optional device that can be connected to your 4622SW IP Telephone. The EU24BL contains 24 buttons onto which your System Administrator sets up additional IP telephone features and/or call appearances (incoming and outgoing lines).
The EU24BL has a backlit display. For usage instructions, see the “EU24/EU24BL Expansion Module User Guide” (Document Number 555-250-702, available at http://www.avaya.com/support).
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