Avaya 9608 - Page 76

Condition Cause/Resolution
AND the telephone
was recently moved.
CAUSE: Loss of communication with the call
server.
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 call server switch. If so, the
new server or switch might need to be
administered to support the telephone.
AND the network was
recently changed to
upgrade or replace
servers, re-
administer the Avaya
Media Server, add or
change NAT, etc.
CAUSE: Loss of communication with the call
server.
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 Avaya Media Server
trunk.
RESOLUTION: Verify which trunk is causing
the echo, and swap the trunk’s Trunk
Termination parameter on the call server.
the user hears echo
on a headset, but not
on a handset.
CAUSE: Improper headset cord.
RESOLUTION: Ensure that an Avaya-
approved headset cord is being used.
the user is on
Speaker and hears
no echo, but the far-
end hears echo.
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.
the user experiences
sudden silences such
as gaps in speech, or
static, clipped or
garbled speech, etc.
CAUSE: Jitter, delay, dropped packets, etc.
RESOLUTION: You can have the user provide
diagnostic data by invoking the Network
Information feature under the A (Avaya Menu)
or Home button on the telephone. One or more
Quality of Service (QoS) features should be
implemented in the network as covered in
Chapter 3:
Using Local Administrative (Craft)
Options on page 33.
CAUSE: Improper non-Category 5 wiring.
RESOLUTION: Replace non-Category 5
wiring with Category 5 wiring.
the user hears
fluctuations in the
CAUSE: The user has changed the Automatic
Gain Control (AGC) or environmental
Troubleshooting
76 H.323 Installation & Maintenance Guide R6.1 May 2011