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4600 Series IP Telephone LAN Administrator’s Guide
Error Conditions
5-2
The telephone stops
working in the middle of
a call,
AND No lights are lit on
the phone and the
display is not lit.
CAUSE: Loss of power
RESOLUTION: Check the connections
between the telephone, the power
supply, and the power jack.
The telephone stops
working in the middle of
a call,
AND Power to the
telephone is fine (and
the telephone may have
gone through the
restarting sequence).
CAUSE: DHCP Lease expired or DHCP
server not available when telephone
attempts to renegotiate DHCP lease.
RESOLUTION: Short-term, restart the
telephone.
Long-term, administer the DHCP
application to allow longer leases
(“Infinite” or “Unlimited” is
recommended).
The telephone had been
working, but does not
work now,
AND no lights are lit on
the phone and the
display is not lit.
CAUSE: Loss of power.
RESOLUTION: Check the connections
between the telephone, the power
supply, and the power jack.
power to the telephone
is fine, but there is no
dialtone. (Display might
show “System Busy”).
CAUSE: Loss of communication with the
PBX switch
RESOLUTION: Check LAN continuity
from the PBX to the telephone (using
ping or trace-route), and from the
telephone to the PBX (by invoking a
feature button). Verify the LAN
administration has not changed for the
TN799 or TN 2302AP boards, or the
LAN equipment (routers, servers, etc.)
between the switch and the telephone.
Verify no one has locally changed the
telephone settings (by using the VIEW
and ADDR codes, as described in the
4600 Series IP Telephone Installation
Guide). Verify the volume on the
telephone is set high enough. Finally,
conduct a self-test.
Table 5-1. Some Error Conditions in Operation of 4600 Series IP Telephones —Continued
Condition Cause/Resolution