Yealink CP920 - Deactivating the Wi-Fi Mode

Yealink CP920 User Guide
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Deactivating the Wi-Fi Mode
You should deactivate the Wi-Fi mode when you need to connect your phone to the wired network.
Procedure
1. Navigate to Menu > Settings > Basic Settings > Wi-Fi
2. Tap Switch to select Off from the Wi-Fi field.
3. Select Save.