Cisco 9971 - Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager

d) Use the included screws and a #2 Phillips-head screwdriver to attach the bracket to the wall.
Figure 11: Mount Wall Bracket
Step 2
Attach the phone bracket to the IP phone and key expansion assembly.
a) Detach the handset cord (and headset cord, if there is a headset), power cord, and any other attached cords
from the base of the phone.
b) Remove the label covers that are conceal the screw holes.
Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager 10.0
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Lockable Wall Mount Components for Phone with Key Expansion Module