Cisco 8961 Administration Manual page 314

Additional troubleshooting information
Summary
Codec mismatch between the phone
and another device
Sound sample mismatch between the
phone and another device
Loopback condition
Additional troubleshooting information
If you have additional questions about troubleshooting Cisco Unified IP Phones, go to the following Cisco
website and navigate to the desired Cisco Unified IP Phone:
http://www.cisco.com/cisco/web/psa/troubleshoot.html
Maintenance
The following sections describe phone maintenance.
Basic Reset
Performing a reset of a Cisco Unified IP Phone provides a way to recover if the phone experiences an error
and resets or restores various configuration and security settings.
Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager
10.0 (SIP)
290
REVIEW DRAFT - CISCO CONFIDENTIAL
Explanation
The RxType and the TxType statistics show the codec that is 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 Display Call Statistics Screen, on page 240
displaying these statistics.
The RxSize and the TxSize statistics show the size of the voice packets
that are used in a conversation between this Cisco Unified IP Phone
and the other device. The values of these statistics should match.
See Display Call Statistics Screen, on page 240
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 (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, reenable the port from the switch.
Troubleshooting and Maintenance
for information about
for information about