Avaya 4600 Series Administrator's Manual page 63

Table 5-1. Some Error Conditions in Operation of 4600 Series IP Telephones —Continued
Condition
The telephone works,
but the audio quality is
poor, specifically:
the network was
recently changed
(servers upgraded or
replaced, DEFINITY
switches, etc.).
the user hears echo
when speaking on a
handset.
the user hears echo on
a headset, but not on a
handset.
the user is on
speakerphone and
hears no echo, but the
far end hears echo.
the user experiences
sudden silences (gaps
in speech), static,
clipped or garbled
speech, etc.
Troubleshooting Guidelines
Cause/Resolution
CAUSE: Loss of communication with the
DEFINITY switch.
RESOLUTION: As above.
CAUSE: Echo from digital-to-analog
conversion on a DEFINITY trunk.
RESOLUTION: Verify which trunk is
causing the echo, and swap the trunk's
Trunk Termination parameter on the
DEFINITY.
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.
CAUSE: Room acoustics
RESOLUTION: Clear the area around
the speakerphone. If that is insufficient,
use the handset.
CAUSE: Jitter, delay, dropped packets,
etc.
RESOLUTION: One or more Quality of
Service (QoS) features should be
implemented in the network (See
Chapter 3 of the 4600 Series IP
Telephone Installation Guide).
CAUSE: Improper (non-Category 5)
wiring.
RESOLUTION: Replace non-Category 5
wiring with Category 5 wiring.
Error Conditions
5-3