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Yealink SIP-T21P User Manual

Yealink SIP-T21P
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Troubleshooting
119
This chapter provides general troubleshooting information to help to solve the problems
you might encounter when using your SIP-T21P 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 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 does the phone display No Service”?
The LCD screen displays No Servicewhen no SIP account registers successfully.
Why doesnt 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 the SNTP server, configure the time
and date manually.
How do I find the basic information of the phone?
Press the OK key when the phone is idle to check the basic information of the phone,
such as the IP address and firmware version. For more the basic information, refer to
Phone Status on page 13.

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Yealink SIP-T21P Specifications

General IconGeneral
Display132 x 64-pixel graphical LCD
Network10/100 Mbps Ethernet
SIP Accounts2
Wall MountableYes
Audio FeaturesHD Voice
ProtocolsSIP v1 (RFC2543), v2 (RFC3261)
Voice CodecsG.711(A/μ), G.729AB, G.726, G.722
Phonebook1000 entries
Call FeaturesCall hold, call waiting, call transfer, call forward, 3-way conferencing
SecuritySRTP, TLS, 802.1x, HTTPS
Ethernet Ports2 x RJ45 10/100 Mbps
Power SupplyPower over Ethernet (PoE) or optional power adapter
Operating Humidity10% to 90% (non-condensing)
LanguagesSupports multiple languages
PoEYes (802.3af)
Operating Temperature-10°C to 50°C

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