Cisco 7800 Series Administration Manual page 112

Remove the Phone from the Non-Lockable Wall Mount for 7811
Figure 9: Tab Location
To remove the phone and mounting plate from the wall bracket, you must disengage these tabs.
Before you begin
You require two screwdrivers or metal rods.
Procedure
Step 1 Push the screwdrivers into the left and right holes in the phone mounting plate approximately 1 in. (2.5 cm).
Step 2
Lift the screwdriver handles up to push down on the tabs.
Cisco IP Phone 7800 Series Multiplatform Phones Administration Guide
98
Hardware and Accessory Installation