Echo on Agent's Side Only

[lanerfy11]

Hi,

I would like to ask for help and recommendation on our Vicidial setup. Agents are suddenly experiencing echoing in calls but there is no echo on the caller's side.
There was a power interruption that rebooted the server on the day before the issue was experienced. There were no agents logged in on that day.
We have checked the status of the Analog card since the line is PSTN and the DAHDI config but no changes were made and there are no echoing on both sides when we call the agents directly to their Eyebeam softphones (agents are not logged in to Vicidial). We have also tried to directly terminate the PSTN line to an analog phone and no echoes experienced upon test calls.
We also tried to barge in during a live call but voices are clear on both sides. We have already rebooted the sever but issue still persists.

Here are the details on our server setup:
Vicidial version: 2.2.1-237
BUILD: 100510-2015
Asterisk version: 1.4.39.1
OS: CentOS 5.8
Card: 4-port WCTDM/0 "Wildcard AEX410 Board 1"
echocanceller=mg2
Memory: 16GB
2-3 agents per day
around 50 calls per day

Thanks!

[kumar2arbind]

hi

For echo you can go for fallowing troubleshoot,
a) Echo is usually caused by ‘crosstalk. That’s when a phone’s microphone picks
up the sounds from the phone’s earpiece because the volume is too high.

Solution: Cover your phone’s mouthpiece. If the echo lessens, it means that you just
need to turn down the volume of your earpiece/speakers.


b) Check codeck, try to use g.711 as default codec.

c) Try reducing the Rtp packet size.

d) Reduce the transmit power level (rx/tx gain), to minimise the volume of the echo but donot
turn it down so low that the far end cannot hear you. This will probably also be hit-and-miss to
find the ideal setting since gain on VoIP calls is usually much higher than PSTN calls.

e) Try a better quality telephone handset.

f) Check for Electromagnetic Interference by such as computers, power strips, and monitors have
large electrical fields which can cause interference.

[lanerfy11]

Hello

Thank you for the recommendations.
Appreciate your reply.
The echoing on the agent side is already gone after another server reboot due to major power outage.
We thought it was some kind of a bug or something because of the power interruption.
I'd still be looking up to the informations you provided regarding echo issues whenever another related case happens.
Thank you again.