Troubleshooting Your Phone
5 - 7
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 550/560 
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 Display 
Contrast on page 2-3.
• 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 for the SoundPoint IP 
550/560 SIP phone away from the 
lights.
• Replace the lights.
• Use the screen capture feature. 
Contact your system administrator to 
determine if it is enabled.