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

Procedure
Step 1
Remove the handset from the cradle and pull the plastic tab from the handset rest.
Step 2
Rotate the tab 180 degrees.
Step 3
Hold the tab between two fingers, with the corner notches facing you.
Step 4
Line up the tab with the slot in the cradle and press the tab evenly into the slot. An extension protrudes from
the top of the rotated tab.
Step 5
Return the handset to the handset rest.
Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager 10.0
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Adjust the Handset Rest