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User Guide for the Polycom VVX 1500 C Business Media Phone for Cisco Unified Communications Manager (SIP)
5 - 4
Troubleshooting Call Issues
Symptom Problem Corrective Action
There is no dial tone. Power is not correctly applied to
the phone.
• 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.
• Switch between Handset, Headset (if
present) or Speakerphone modes 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.
• 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 2-22.