Yealink SIP-T38G - Manual (Page 121)

Troubleshooting
111
This chapter provides general troubleshooting information to help you solve the
problems you might encounter when using your SIP-T38G 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, or
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 "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 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’t I 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 12 .
Check whether dial tone is present on one of the audio modes.

Switch between the Handset, Headset (if present) or Hands-Free Speakerphone to
check whether dial tone is present for one of the audio modes.

If the dial tone exists on another audio mode, connect a different handset or
headset to isolate the problem.