Yealink SIP-T20P User Manual

Troubleshooting
87
This chapter provides general troubleshooting information to help you solve the
problems you might encounter when using your SIP-T20P 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 your phone is properly plugged into a functional AC outlet.
 Ensure that the phone isn’t plugged into a plug controlled by a switch that is off.
 If the phone is plugged into a power strip, try plugging it directly into a wall outlet
instead.
 If your phone is powered from PoE, ensure you use a PoE compliant switch or hub.
Contact your system administrator for more information.
 Check that the power LED is on to ensure the phone is powered on.
Why does the phone display ―No Service‖?
The phone LCD screen prompts ―No Service‖ message when the SIP accounts do not
register successfully. Contact your system administrator for more information on account
settings.
Why can I not get a dial tone?
Check for any loose connections and that the phone has been installed properly. For the
installation instructions, refer to Phone Installation on page 11.
Check whether the dial tone is present on one of audio modes.
 Switch between the Handset, Headset (if present) or Hands-Free Speakerphone to
check if the dial tone is present for one of audio modes.
 If the dial tone exists on another audio mode, connect another handset or headset
to isolate the problem.
Why does the phone not ring?
Check the ringer volume on your phone. To adjust the ringer volume setting, press the
volume key when the phone is on-hook and idle. For more information, refer to Volume
on page 22.

Yealink SIP-T20P Specifications

General

Keypad number of keys	31
Speakerphone	Yes
Voice codecs	G.711, G.722, G.723.1, G.726
Mounting	Desk/Wall
Handset type	Wired handset
Product type	IP Phone
Product color	Black
Touchscreen	-
Lines quantity	2 lines
Phonebook capacity	1000 entries
Number of VoIP accounts	2
Bluetooth	No
Security algorithms	HTTPS, SSL/TLS
AC adapter input voltage	100 - 240 V
AC adapter output voltage	5 V
Power consumption (typical)	2.6 W
Operating relative humidity (H-H)	10 - 95 %
Compliance industry standards	IEEE 802.3af
Number of handles included	1 pc(s)

Weight and Dimensions

Depth	200 mm
Width	185 mm
Height	90 mm
Weight	770 g