Yealink SIP-T42G User Manual

Troubleshooting
161
This chapter provides general troubleshooting information to help you solve the
problems you might encounter when using your SIP-T42G IP phone.
If you require additional information or assistance with your new phone, contact your
system administrator.
Why is the phone LCD screen blank?
 Ensure that the phone is properly plugged into a functional AC outlet.
 Ensure that the phone is plugged into a socket controlled by a switch that is on.
 If the phone is plugged into a power strip, try plugging it directly into a wall outlet
instead.
 If the phone is powered from PoE, ensure you use a PoE-compliant switch or hub.
Why does the phone display “Network unavailable”?
 Ensure that the Ethernet cable is plugged into the Internet port on the phone and
the Ethernet cable is not loose.
 Ensure that the switch or hub in your network is operational.
 Contact your system administrator for more information.
Why doesn’t the phone display time and date correctly?
Check if you have configured the phone to obtain the time and date from the SNTP
server automatically. If the phone fails to connect to the SNTP server, you need to
configure the time and date manually.
How can I find the basic information of the phone?
Press the OK soft key to check the basic information of the phone when the phone is idle,
such as the IP address and firmware version. For more basic information, refer to Phone
Status on page 29.
How to obtain the MAC address of a phone when the phone is not powered on?
Three ways to obtain the MAC address of a phone:
 You can ask your supplier for shipping information sheet which includes MAC
addresses according to the corresponding PO (Purchase Order).

Yealink SIP-T42G Specifications

General

Power requirements	100-240V, DC 5V
Power over Ethernet (PoE)	Yes
Touchscreen	-
Display diagonal	2.7 \
Display resolution	192 x 64 pixels
Lines quantity	- lines
Phonebook capacity	1000 entries
Number of VoIP accounts	3
Voice codecs	G.711, G.723, G.729A, G.729B
Bluetooth	No
RJ-9 ports quantity	2
Ethernet LAN (RJ-45) ports	1
Storage temperature (T-T)	-10 - 50 °C
Operating relative humidity (H-H)	10 - 95 %
Mounting	Desk/Wall
Handset type	Wired handset
Product type	IP Phone
Product color	Black, Grey
Number of handles included	1 pc(s)

Weight and Dimensions

Depth	175 mm
Width	212 mm
Height	189 mm