Chapter 9 Troubleshooting and Maintenance
General Troubleshooting Tips
9-16
Cisco Unified IP Phone 7961G/7961G-GE and 7941G/7941G-GE for Cisco Unified Communications Manager 6.1
OL-14620-01
Codec mismatch between the phone
and another device.
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 a transcoder is in
place to handle the service.
See the
“Call Statistics Screen” section on page 7-16
for
information about displaying these statistics.
Sound sample mismatch between the
phone and another device.
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 the
“Call Statistics Screen” section on page 7-16
for
information about displaying these statistics.
Gaps in voice calls.
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 the
“Call Statistics Screen” section on page 7-16
for
information about displaying these statistics.
Loopback condition.
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 (the power supply is
disconnected)
In this case, the switch port on the phone can become disabled
and the following message will appear in the switch console
log:
HALF_DUX_COLLISION_EXCEED_THRESHOLD
To resolve this problem, re-enable the port from the switch.
Table 9-2
Cisco Unified IP Phone Troubleshooting (continued)
Summary
Explanation
Summary of Contents for 7941G - Unified IP Phone VoIP
Page 4: ......