Yealink SIP-T28P - Manual (Page 41)

Customizing Your Phone
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Settings->Keypad Lock.
2. Press or , or the Switch soft key to select Disable from the Keypad Lock
field.
3. Press the Save soft key to accept the change.
Keypad lock is configurable via web user interface at the path Features->Phone Lock.
You can press the Volume key to adjust the ringer volume when the phone is idle. You
can also press the Volume key to adjust the receiver volume of currently engaged audio
devices (handset, speakerphone or headset) when the phone is in use.
To adjust the volume when the phone is idle:
1. Press to adjust the ringer volume.
Note If the ringer volume is adjusted to minimum, the icon will appear on the LCD screen.