Cisco 8961 Administration Manual page 227
Administration guide for cisco unified communications manager 8.6 (sip)
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Also See for 8961:
- Administration manual (378 pages) ,
- User manual (180 pages) ,
- Features (35 pages)
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Chapter 12
Troubleshooting and Maintenance
Table 12-2
Cisco Unified IP Phone Troubleshooting (continued)
Summary
Blocky or distorted video
No Video or black video screen
Frozen video
Slow moving video or jittery video
Audio/Video synchronization is poor
Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager 8.6 (SIP)
Explanation
Blocky or distorted video is generally a symptom of a degraded network. It is
also caused by endpoints that do not closely adhere to video transmission
standards.
If the network is degraded, navigate to AdminSettings > Status > CallStatistics
> Video > Video statistics, and check the following:
Rcvr Lost Packets
•
Rcvr Discarded
•
Avg Jitter
•
Max Jitter
•
The video is black and no picture appears on the screen.
Verify that video is enabled in the Cisco Unified CM.
•
Cisco Unified IP Phone 8961, 9951, and 9971 phones do not display videos
•
with a resolution higher than VGA. If the other endpoint transmits at a
resolution greater than VGA, it results in a black screen. Check the
resolution of the transmitting endpoint.
There might not be any packets received for video display. Check the Rcvr
•
Packets (would be zero in this case) in the AdminSettings > Status >
CallStatistics > Video > Video statistics.
Ensure that the transmitting phone has the camera shutter completely open.
•
When the phone stops receiving video packets, the video displayed pauses,
displaying the last decoded video frame.
Check if the received packets count is incrementing or not, by navigating to
•
AdminSettings > Status > CallStatistics > Video > Video statistics >
Rcvr Packets statistics.
Try to hold and then resume the call to clear the issue.
•
If the transmitting phone is also Cisco Unified IP Phone 8961 or 9951 or
•
9971, check the LED on top of the camera. If there is no light illuminated
(either green or red) then the remote camera might not be transmitting video.
The frame rate of the received video is low. Check the rate by navigating to
AdminSettings > Status > CallStatistics > Video > Video statistics > Rcvr
Frame Rate. Frame rates less than 15 fps result in slow-moving video.
Check if RTCP is enabled in the Cisco Unified Communications Manager.
•
Audio/video synchronization is generally caused a by degraded network
•
connection. Check by navigating to navigating to AdminSettings > Status
> CallStatistics > Video > Video statistics > Avg Jitter and
AdminSettings > Status > CallStatistics > Video > Video statistics > Max
Jitter values.
Try to hold and then resume the call to restore the audio/video
•
synchronization.
General Troubleshooting Tips
12-13
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Troubleshooting
