required steps if you are facing Echoes In the Line

The possible causes are as follows:

• The network is abnormal.
• The echoes are acoustic feedback from the user's microphone.
• The EC function is not enabled.
• The device gain is improper.
• The Echo Cancellation (EC) function is incorrectly.

1. See Network Analysis to check whether the network connection is normal.
   • If the network connection is abnormal, verify that the network cables are connected properly.
   • If the network connection is normal, go to the next step.

2. The PSTN user covers the microphone to check whether the echoes disappear.
   • If no, disable the hands-free function.
   • If yes, go to the next step.

3. See Logging In to the unified gateway Using the LMT to run the show system voip argu algo<g711&g729&g723&ilbc_1520&ilbc_1333> to check whether the EC function is opened.

   System VoIP Arguments
   
   
   PacketTime  : 20
                        EchoCancel  : [ON]
                       GainControl  : 14
                SilenceSuppression  : [OFF]
     JitterThreshold(min/max/init)  : 20(ms)/200(ms)/20(ms)
                         CRCswitch  : [NULL]
   
   
   ====  Command executed success !  ====

   • If the status is OFF, run the config system voip algo <g711&g729&g723&ilbc_1520&ilbc_1333> echocancel on to open the EC function
   • If the status is ON, go to the next step.

4. See 2 to reduce device gain.
   • If the network connection is abnormal, verify that the network cables are connected properly.
   • If the network connection is normal, go to the next step.

5. Contact the peer office's engineers to check whether the Echo Cancellation (EC) function is correctly configured in the peer gateway.
   • If no, contact to the peer office's engineers to troubleshoot.
   • If yes, go to the next step.

6. If the fault still persists, collect detailed fault information and related logs by referring to Collecting and Reporting Fault Information and send them to the service provider.