User Guide for the SIP-T28P IP Phone 
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To deactivate the phone lock via phone user interface: 
1.  Press Menu->Settings->Advanced Settings (default password: admin) ->Phone 
Lock. 
2.  Press          or          , or the Switch soft key to select Disabled from the Phone Lock 
field. 
 
3.  Press the Save soft key to accept the change. 
Phone 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.