Yealink SIP-T23P [114/841] Details of the configuration parameter

Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series IP Phones

6. Click Confirm to accept the change.

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-T27P, SIP-T23P/G, SIP-T21(P) E2 and

SIP-T19(P) E2 IP phones, EXP39 connected to SIP-T29G/T27P IP phones and EXP40

connected to SIP-T48G/T46G IP phones. Make sure the expansion module has been

connected to the IP phone before adjustment.

Procedure

Contrast can be configured using the configuration files or locally.

Configuration File

<y0000000000xx>.cfg

Configure the contrast of the LCD

screen.

Parameter:

phone_setting.contrast

Local

Web User Interface

Configure the contrast of the LCD

screen.

Navigate to:

http://<phoneIPAddress>/servlet

?p=settings-preference&q=load

Phone User Interface

Configure the contrast of the LCD

screen.

Details of the Configuration Parameter:

Parameter

Permitted Values

Default

phone_setting.contrast

Integer from 1 to 10

Description:

Configures the contrast of the LCD screen.

For T48G/T46G IP phones, it configures the LCD’s contrast of the connected EXP40

only.

For T29G IP phones, it configures the LCD’s contrast of the connected EXP39 only.

For T27P IP phones, it configures the LCD’s contrast of the IP phone and the

connected EXP39.

For T23P/T23G/T21(P) E2/T19(P) E2 IP phones, it configures the LCD’s contrast of the IP

phone.