Avaya 4600 Series Administrator's Manual page 102

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.
102 4600 Series IP Telephone Release 2.2 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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