[Asterisk-Users] Polycom Echo

[John Baker]

No, there is no echo canceling on the handset.  I wasted alot of time on
this before I got the following answer from Polycom:

---------------------------------------------------------
John

it turns out that we do not support Handset AEC at this time. This is
something we plan to support in the future, but should not have been
entered
in the Admin Guide.

I apologize if you have lost time due to this error on our part.

/dgr

_______________________________________________
Dave Russell
Product Manager
Polycom - Voice Communications Division
 
1000 West 14th Street, North Vancouver, BC, V7P 3P3
o: +1.604.982.3439  f: +1.604.990.5475
m:+1.604.230.1606

-----------------------------------------------------


Try the following settings in your zapata.conf; they eliminated echo for
me:


rxgain=-2
txgain=-2
echocancel=32
echocancelwhenbridged=yes
echotraining=yes

John


On Wed, 2004-08-11 at 11:56, Tor Roberts wrote:
> 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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