Echo

[George Khalaf]

I have the echo problem on my asterisk in all my installation, does any body have an answer of what this could be and how to fix it

[Lance Koster]

Sure, tell us about your installs. What asterisk version, what hardware, what type of phones or soft phones? Need more input... Also remember echo is normal, you are probably talking about side-tone?

Lance - Tampa.

[Vincent Luba]

Hello,

echo may be generated at many levels. When it happens at TDM cards level, on try may be using cards featuring echo cancellation, can be hardware or software.

Some times back, one could build asterisk with an "aggressive" echo cancellation mechanism. I don't know if it's still used, as my prefered choice was to deal with echo at tdm cards level.

Something else may be playing with gains on the lines.

This may help you : http://wiki.sangoma.com/wanpipe-linux-asterisk-debugging#SWEC

[Keith Masavage]

Hi George,

My name is Keith Masavage. I am an independent consultant and have worked on a number of systems in the past. One I'm familiar with is from Interactive Intelligence. I realize that this isn't the system you are referring to, but often echo is cause by some of the same factors, regardless of the manufacturer.

Some of the factors that can cause this are:

The type of headsets or phones that are being used. Be sure, especially with call center type headsets and conference speaker phones that they have good echo cancellation.

The second has to do with the A-to-D converters used in the system. As most of these are digital, you may be able to tune some of the parameters. These parameters I've found can have a dramatic effect on echo.

Third, a feedback loop. Usually these are hardware problems so I wouldn't expect to see it with your setup since you say "ALL" your installations have the problem. I could be a system problem with a PCB design, but I doubt it. More likely one of the first two.

Interactive Intellegence has some good trouble shooting tips on their website that might help even though you are using someone else's system. Try this URL and see if there is any insight you might gain...

http://www.inin.com/productsolutions/pages/enterprise-ip-telephony....

I think there is a troubleshooting section if you nose around a little that may shed some generic light on the problem.

Keith
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