Cisco Ip Phone 8800 Series Administration Guide For Cisco Unified Communications Manager - Cisco 8800 Series Administration Manual

Set Up Key Expansion Module in Cisco Unified Communications Manager Administration
Note
Step 11 (Optional) Install the footstands on the phone and on the key expansion modules, and adjust all footstands
to rest evenly on the work surface.
Step 12 Plug the Ethernet cable into the phone.
Set Up Key Expansion Module in Cisco Unified Communications Manager
Administration
During the Key Expansion Module setup, you can configure the KEM to display on one-column or two-column
mode.

Cisco IP Phone 8800 Series Administration Guide for Cisco Unified Communications Manager

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Make sure that the screws are fully inserted into the phone and
tightened.