Avaya 4600 Series Administrator's Manual page 114

Troubleshooting Guidelines
Table 10: 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 phone does not ring.
114 4600 Series IP Telephone Release 2.3 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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