Cisco 6800 Series Administration Manual page 127

Phone Accessories
Figure 9: Mounting Holes
1
2
Step 8 Firmly slide the phone down into place as shown in the following image:
Figure 10: Sliding the IP Phone
Install the Cisco IP Phone 6821 Multiplatform Phones on a Wall
Mounting Hole on the Phone
Wall Mount Pin on the Wall Mount Plate
Cisco IP Phone 6800 Series Multiplatform Phones Administration Guide
113