User's Manual

Troubleshooting
112
Troubleshooting
Why is the phone LCD screen blank?

Ensure your phone is properly plugged into a functional AC outlet.

Ensure that the phone is not 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 if the power LED is on to ensure that the phone is powered on.
Why does the phone display “Network Unavailable”?
To resolve:
 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 functioning well.
 If the problem persists, Contact your system administrator for more information.
Why can’t I get a dial tone?
To resolve:
 Check for any loose connections and that the phone has been installed properly. For
the Installation instructions, refer to the Phone Installation section.
 Check whether dial tone is present on one of the audio modes.
 Switch between the Handset, Headset (if you have) 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.
Where to set the tone?
You can set the tone on web interface:

Click Setting→ Tones

Define the Dial Tone, Ringback Tone, Busy Tone…
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For the tones, you can check with your system administrator.

For More Click Configure Ring Tones.