Updated May 11, 1999
April 1, 1999
Products Affected
|
Product |
Remarks |
|---|---|
|
IGX-UVM |
Model A with Firmware Version A |
|
IGX-UVM |
Model B with Firmware Version A |
|
IGX-UVM |
Model C with Firmware Version A |
|
IGX-UVM |
Model D with Firmware Version A |
|
IGX-UVM |
Model E with Firmware Version A |
Problem Description
In some instances, the UVM Echo Canceller ceases to cancel echo on some voice channels. The result is echo during phone calls. In extreme cases, the echo renders the channel unusable.
Background
This problem has been observed only on channels configured for G.164 Tone Disabler. Once a channel is in this state, the echo is constant. Experience is that one channel in 100 (configured for G.164 tone disabler) will enter this state over a three day period in a noisy office environment.
Problem Symptoms
The user will notice echo on all calls across affevted UVM channels. Once the channel is in the no-echo state, it remains in this state until the workaround is applied.
Workaround/Solution
WorkAround:
If G.164 tone disabler is configured, change it to G.165 (cnfecparm) to clear the stuck channel and prevent future occurrences.
If G.165 tone disabler is configured, changing this setting to G.164 and then back to G.165 will clear the stuck channel.
Solution:
Currently, there is no solution to this anomaly. Bug CSCdk76161 has been opened to track this problem and its resolution. Please use the Bugwatcher feature available in CCO Bug Toolkit to track this bug.
DDTS
To follow the bug ID link below and see detailed bug information, you must be a registered user and you must be logged in.
|
DDTS |
Description |
|---|---|
|
CSCdk76161 (registered customers only) |
Echo persists on a channel until UVM EC is reset. |
For More Information
If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods: