Cisco 7800 Series

Procedure
Step 1
On the Cisco IP Phone, press Applications .
Step 2
Select Accessories.
Step 3
Highlight the analog headset, then press Setup.
Step 4
Press On to turn on the wideband and press Off to turn off the wideband.
Cisco IP Phone 7800 Series Administration Guide for Cisco Unified Communications Manager
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Headsets