Avaya 4600 Series Administrator's Manual page 126

Troubleshooting Guidelines
Table 14: Some Error Conditions in Operation of 4600 Series IP Telephones (continued)
Condition
The telephone works, but the
audio quality is poor, specifically:
The 4612 or 4624 IP Telephone works
properly except the telephone does not ring.
126 4600 Series IP Telephone LAN Administrator Guide
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 Speaker
and hears no echo, but
the far-end hears echo.
the user experiences
sudden silences such
as gaps in speech, or
static, clipped or
garbled speech, etc.
Cause/Resolution
CAUSE: Echo from digital-to-analog
conversion on your Avaya Media Server trunk.
RESOLUTION: Verify which trunk is causing
the echo, and swap the trunk's Trunk
Termination parameter on the PBX.
CAUSE: Improper headset adapter.
RESOLUTION: Replace adapter with Avaya's
M12LU or 3412-HIC adapters. We recommend
the M12LU, since it supports Automatic Gain
Control.
CAUSE: Room acoustics.
RESOLUTION: Ensure that there are six
inches or so of blank space to the right of the
telephone. 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.
CAUSE: The Ringer Off (RngOF) softkey
feature has been activated.
RESOLUTION: Use the softkey Menu option
to access the RngOF feature. A
downward-pointing triangle means the Ringer
is off. Ensure that the triangle points up. Also,
check the Volume setting on the telephone.
Finally, do a self-test on the telephone.
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