Yealink SIP-T21 E2

Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
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5. Select the desired value from the pull-down list of Display Text Message Popup.
6. Click Confirm to accept the change.
Contrast
Contrast determines the readability of the texts displayed on the LCD screen. Adjusting the
contrast to a comfortable level can optimize the screen viewing experience. When configured
properly, contrast allows users to read the LCD’s display with minimal eyestrain. You can
configure the LCD’s contrast of SIP-T40P/G, SIP-T27P/G, SIP-T23P/G, SIP-T21(P) E2, SIP-T19(P)
E2, CP860 and CP920 IP phones, EXP20 (connected to SIP-T29G/T27P/T27G IP phones) and
EXP40 (connected to SIP-T48G/T48S/T46G/T46S IP phones). Make sure the expansion module
has been connected to the IP phone before adjustment.
It is not applicable to SIP-T54S/T52S/T42G/T42S/T41P/T41S IP phones.
Procedure
Contrast can be configured using the following methods.
Central Provisioning
(Configuration File)
<y0000000000xx>.cfg
Configure the contrast of the LCD
screen.
Parameter:
phone_setting.contrast
Web User Interface
Configure the contrast of the LCD
screen.
Navigate to:
http://<phoneIPAddress>/servlet?