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Yealink T27P Administrator's Guide

Yealink T27P
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Configuring Basic Features
65
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 LCDs contrast of SIP-T27P, SIP-T23P/G and SIP-T21(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 LCDs contrast of
SIP-T27P, SIP-T23P/G and SIP-T21(P)
E2 IP phones, EXP39 connected to
SIP-T29G/T27P IP phones and
EXP40 connected to
SIP-T48G/T46G IP phones.
Parameter:
phone_setting.contrast
Local
Web User Interface
Configure the LCDs contrast of
SIP-T27P, SIP-T23P/G and SIP-T21(P)
E2 IP phones.
Navigate to:
http://<phoneIPAddress>/servlet
?p=settings-preference&q=load
Phone User Interface
Configure the LCDs contrast of
SIP-T27P, SIP-T23P/G and SIP-T21(P)
E2 IP phones, EXP39 connected to
SIP-T29G/T27P IP phones and
EXP40 connected to
SIP-T48G/T46G IP phones.
Details of the Configuration Parameter:
Parameter
Permitted Values
Default
phone_setting.contrast
Integer from 1 to 10
6
Description:
Configures the contrast of the LCD screen.

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Yealink T27P Specifications

General IconGeneral
Wall MountableYes
Local Phonebook1000 entries
BluetoothNo
Wi-FiNo
Gigabit EthernetNo
Display3.66" 240x120 pixel graphical LCD with backlight
Audio FeaturesHD voice, Full-duplex speakerphone
NetworkDual-port 10/100 Ethernet switch
ProtocolsSIP v1 (RFC2543), v2 (RFC3261)
PowerIEEE 802.3af PoE
Connectivity2 x RJ45 10/100M Ethernet ports
Voice CodecsG.711(A/μ), G.722, G.723, G.729AB, G.726
EHSSupports EHS with Plantronics headsets
Headset PortYes
Power Adapter5V DC (optional)

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