[Asterisk-Users] Polycom Echo

[Tor Roberts]

John,
I have a dozen polycom ip 600 phones that are connected to the PSTN with 
two, digium 4 port fxo cards. I also had a lot of near side echo, but I 
do not believe that it came from the phones. I was able to get rid of it 
with these settings in my zapata.conf:

echocancel=yes
echocancelwhenbridged=yes
echotraining=500
rxgain=8.0
txgain=0.0

The polycoms do have echo canceling hardware buit in, but by default 
only works on the speakerphone. You can enable it on the handset as 
well, but in my case, it made no difference because the echo came from 
the fxo cards.

-Tor

John Bittner wrote:

>Hi,
>
>Just install 6 new polycoms at a customer and all of them have a major echo
>issue. Have asterisk connected to the PSTN via digium 4 port fxo card in a
>P4 running fedora.
>
>I have tweaked zapata ....ran ztmonitor... just as a test I attached a cisco
>7960.... the cisco has no echo problems.
>
>Another issue I came up on is when I enable echo training I no longer can
>hear any inbound voice.
>
>Does anyone know if there is a setting in the polycom config that will cause
>this. 
>
>The echo on the phones happen only on my side and only when I speak. The
>polycoms play back my voice but delayed.
>
>Any help would be appreciated.
>
>Thanks
>
>John Bittner
>Simlab.net
>
> 
>
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