Cisco 7942G - Unified IP Phone VoIP Fehlersuche und Wartung - Seite 18

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Cisco 7942G - Unified IP Phone VoIP Fehlersuche und Wartung
General Troubleshooting Information
Summary
Codec mismatch between the phone and another
device
Sound sample mismatch between the phone and
another device
Gaps in voice calls
Loopback condition
Troubleshooting and Maintenance
18
Troubleshooting and Maintenance
Explanation
The RxType and the TxType statistics show the codec
that is being used for a conversation between this
Cisco Unified IP phone and the other device. The
values of these statistics should match. If they do not,
verify that the other device can handle the codec
conversation, or that a transcoder is in place to handle
the service.
See
Call Statistics Screen
for information about
displaying these statistics.
The RxSize and the TxSize statistics show the size of
the voice packets that are being used in a conversation
between this Cisco Unified IP phone and the other
device. The values of these statistics should match.
See
Call Statistics Screen
for information about
displaying these statistics.
Check the AvgJtr and the MaxJtr statistics. A large
variance between these statistics might indicate a
problem with jitter on the network or periodic high
rates of network activity.
See
Call Statistics Screen
for information about
displaying these statistics.
A loopback condition can occur when the following
conditions are met:
• The SW Port Configuration option in the
Network Configuration menu on the phone is set
to 10 Half (10-BaseT / half duplex)
• The phone receives power from an external
power supply
• The phone is powered down or the power supply
is disconnected
In this case, the switch port on the phone can become
disabled and the following message appears in the
switch console log:
HALF_DUX_COLLISION_EXCEED_THRESHOLD
To resolve this problem, re-enable the port from the
switch.