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Troubleshooting Guidelines
Error Conditions
5-3
The telephone had been
working, but does not
work now, (continued)
AND the telephone was
recently moved.
CAUSE: Loss of communication with the
PBX.
RESOLUTION: As above, but pay
particular attention to the possibility that
the telephone is being routed to a
different DHCP server, or even a
different PBX switch. If so, the new
server or switch may need to be
administered to support the telephone.
the network was
recently changed
(servers upgraded or
replaced, your
DEFINITY/MultiVantage
switches, etc.).
CAUSE: Loss of communication with the
PBX.
RESOLUTION: As above.
The telephone works,
but the audio quality is
poor, specifically:
the user hears echo
when speaking on a
handset.
CAUSE: Echo from digital-to-analog
conversion on your DEFINITY/
MultiVantage trunk.
RESOLUTION: Verify which trunk is
causing the echo, and swap the trunk’s
Trunk Termination parameter on the
PBX.
the user hears echo on
a headset, but not on a
handset.
CAUSE: Improper headset adapter.
RESOLUTION: Replace adapter with
Avaya’s M12LU or 3412-HIC adapters.
The M12LU is recommended, since it
supports Automatic Gain Control.
the user is on
speakerphone and
hears no echo, but the
far end hears echo.
CAUSE: Room acoustics
RESOLUTION: Ensure there are six
inches or so of blank space to the right of
the telephone. If that is insufficient, use
the handset.
Table 5-1. Some Error Conditions in Operation of 4600 Series IP Telephones —Continued
Condition Cause/Resolution