Yealink SIP-T4U Series

Using Handsets with T57W/T54W/T53W/T53 Phones
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If you change this parameter, the phone will reboot to make the change take effect.
Handset Settings Parameters
Parameter
custom.handset.eco_mode.enable <y0000000000xx>.cfg
Description
It enables or disables the eco mode to greatly reduce the transmission power and signal output when
the phone is in the talk mode.
Permitted
Values
-1-Do not modify the configuration.
0-Disabled
1-Enabled
Default
-1
Supported
Devices
All handsets except DD phones
Handset UI
OK > Settings > System Settings (Basic Settings) > Eco Mode
Parameter
custom.handset.color_scheme <y0000000000xx>.cfg
Description
It configures the color scheme of the handset.
Note: It will take effect on all handsets that are registered on the same phone. It works only if the value
of the parameter “static.auto_provision.handset_configured.enable” is set to 1 (Enabled).
Permitted
Values
-1-Do not modify the configuration.
0-Color scheme 1
1-Color scheme 2
Default
-1
Supported
Devices
W52H
Handset UI
OK > Settings > Display > Color Schemes
Parameter
custom.handset.missed_call_notify_light.enable <y0000000000xx>.cfg
Description
It enables or disables the message key LED to flash red when the handset misses a call.
Note: It will take effect on all handsets that are registered on the same phone. It works only if “stat-
ic.auto_provision.handset_configured.enable” is set to 1 (Enabled).
Permitted
Values
-1-Do not modify the configuration.
0-Disabled
1-Enabled
Default
-1
Supported
Devices
W52H
Handset UI
OK > Settings > Display > Notification Light > Missed Call
Parameter
custom.handset.voice_mail_notify_light.enable <y0000000000xx>.cfg
Description
It enables or disables the message key LED to flash when the handset receives a voice mail.
Note: It will take effect on all handsets that are registered on the same phone. It works only if “stat-
ic.auto_provision.handset_configured.enable” is set to 1 (Enabled).
Permitted
-1-Do not modify the configuration.