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Troubleshooting Your Phone
5 - 5
Calling
Symptom Problem Corrective Action
There is no dial tone. Power is not correctly applied to
the phone.
Do one of the following steps:
• Check that the display is illuminated.
• Make sure the LAN cable is inserted
properly at the rear of the phone (try
unplugging and re-inserting the
cable).
• If using Power over Ethernet (PoE),
have your system administrator check
that the switch is supplying power to
the phone.
Dial tone is not present on one of
the audio paths.
Do one of the following steps:
• Switch between Handset, Headset (if
present) or Hands-Free
Speakerphone to see if the dial tone is
present on other paths.
• If the dial tone exists on another path,
connect a different handset or
headset to isolate the problem.
The phone does not ring. Ring volume is low. While the phone is idle, adjust the ringing
level by pressing or .
Outbound or inbound calling is
unsuccessful.
Do one of the following:
• Place a call to the phone under
investigation. Check that the display
indicates incoming call information.
• Lift the handset. Ensure the dial tone
is present and place a call to another
extension or number. Check that the
display changes in response.
The phone has a Silent ring tone. Choose a ring tone other than Silent. See
Updating the Ring Tone on page 2-20.
“Service Unavailable” appears
on the graphic display.
The user tapped the New Call
soft key, dialed a number with the
handset on-hook, or attempted to
make a call from the contact
directory when the phone was
not registered.
Check with your system administrator to
see when your phone will be registered.