Troubleshooting; Why Is The Lcd Screen Blank?; Why Does The Phone Display “Network Unavailable”?; Why Doesn’t The Phone Display Time And Date Correctly? - Yealink SIP-T21 E2 User Manual

This chapter provides general troubleshooting information to help you solve the
problems you might encounter when using your SIP-T21(P) E2 IP phone.
If you require additional information or assistance with your new phone, contact your
system administrator.

Why is the 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 to plug it directly into a wall outlet

instead.
If your SIP-T21P E2 IP 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 does the phone display "No Service"?
The LCD screen displays "No Service" when no SIP account registers successfully.
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 IP phone?
Press the OK key when the IP phone is idle to check the basic information of the IP phone,
such as IP address and firmware version. For more basic information, refer to
Status on page 16.

Troubleshooting

Phone
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