Cisco 6921 User Manual page 39

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Remove the handset from the cradle and pull the plastic tab from the handset rest.
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Rotate the tab 180 degrees.
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Hold the tab between two fingers, with the corner notches facing you. Make sure the tab lines
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up evenly with the slot in the handset cradle.
Press the tab evenly into the slot. An extension protrudes from the top of the rotated tab. Return
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the handset to the handset rest.
Cisco Unified IP Phone User Guide for Cisco Unified Communications Manager 8.5 (SCCP and SIP)
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Your Phone
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