Yealink T27P Administrator's Guide

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 LCD’s 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 LCD’s 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 LCD’s 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 LCD’s 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.

Yealink T27P Specifications

General

Wall Mountable	Yes
Local Phonebook	1000 entries
Bluetooth	No
Wi-Fi	No
Gigabit Ethernet	No
Display	3.66" 240x120 pixel graphical LCD with backlight
Audio Features	HD voice, Full-duplex speakerphone
Network	Dual-port 10/100 Ethernet switch
Protocols	SIP v1 (RFC2543), v2 (RFC3261)
Power	IEEE 802.3af PoE
Connectivity	2 x RJ45 10/100M Ethernet ports
Voice Codecs	G.711(A/μ), G.722, G.723, G.729AB, G.726
EHS	Supports EHS with Plantronics headsets
Headset Port	Yes
Power Adapter	5V DC (optional)