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Troubleshooting Your Phone
89
Displays
Symptom Problem Corrective Action
There is no display.
The display is incorrect.
The display has bad contrast.
Power is not correctly applied to
the SoundPoint IP 450 phone.
Do one of the following:
• Check that the screen is illuminated.
• Make sure the LAN cable is inserted
properly at the back of the phone (try
unplugging and re-inserting the
cable).
• If using Power over Ethernet (PoE),
have your system administrator check
that the switch is supplying power to
the phone.
• Use the screen capture feature.
Contact your system administrator to
determine if it is enabled.
The contrast needs adjustment. Do one of the following:
• Refer to Changing the Backlight
Brightness on page 74.
• Reboot the phone to obtain a default
level of contrast.
• Use the screen capture feature.
Contact your system administrator to
determine if it is enabled.
Outbound or inbound calling is
unsuccessful.
Do one of the following:
• Place a call to the phone under
investigation. Check that the screen
indicates incoming call information.
• Lift the handset. Ensure the dial tone
is present and place a call to another
extension or number. Check that the
screen changes in response.
• Use the screen capture feature.
Contact your system administrator to
determine if it is enabled.
The display flickers. A certain type of older
fluorescent lighting causes the
display to appear to flicker.
Do one of the following:
• Move the Polycom SoundPoint IP 450
User Guide 450 SIP phone away from
the lights.
• Replace the lights in your work
environment.
• Use the screen capture feature.
Contact your system administrator to
determine if it is enabled.