User Guide SoundPoint IP 550
5.Press 
or the Exit soft key repeatedly to return to the idle display.
Backlight Intensity
Backlight intensity on the SoundPoint IP 550 phone has three modes:
•Backlight On
•Backlight Idle
•Dim
You can modify the Backlight On intensity and the Backlight Idle intensity separately. You can select high, medium, low, and off levels for both.
Dim mode intensity is determined by the Backlight On intensity and the Backlight Idle intensity together as follows:
Backlight On Intensity | Backlight Idle Intensity | Dim Intensity |
|
|
|
off | off | off |
|
|
|
low | dimmer than low | low |
|
|
|
medium | dimmer than medium | medium |
|
|
|
high | off | medium |
|
|
|
high | low | medium |
|
|
|
high | medium | medium |
|
|
|
high | high | high |
|
|
|
The Backlight On mode turns on for following events:
•Any key press
•Hookswitch release
•Incoming calls
•Ending a call, holding a call, resuming a call by the other party
•A voice or instant message received
•A USB device plugged in or unplugged
If you do not press any keys on the phone, after 20 seconds of the backlight turning on, the backlight dims (or changes) to medium in the following cases:
•A call is in progress
•A call is on hold
2 - 4
