[Asterisk-Users] Echo problem

[Michael D Schelin]

Hi Martin, There was an great post last week about echo. It stated that 
the order of the lines matters. It does. The channels must be listed 
last for the echo cancel and most other things to work. Rx and TX gain 
is one of the things also affected. Now I'm using TE110 card in my 
system. I hope this helps because I'm not sure about Analog lines.





Martin Roy wrote:

> Ok I tried Digium TDM400 cards, I tried X100p cards, I tried Clipcomm  
> CG-410 4 FXOs device. Now I just ordered a few Sipura 3000.
> 
> With the Digium TDM04B cards (4 FXOs) and X100p cards I tried the  
> following :
> 
> echocancel=yes
> echocancelwhenbridged=yes
> echotraining=yes (I tried 800 with TDM04B cards but it didn't made  any 
> difference)
> rxgain= I tried from -8.0 to 10.0
> txgain = I tried from -8.0 to 10.0
> 
> by the way I live in Canada and the provider is Bell Canada for all  
> lines (I have over 10 lines at one place and 3 lines at another places)
> 
> I tried on a bunch of different computers. I tried on a P4, a dual  
> Xeon, a dual AMD Opteron, a bunch of Macs too (for X100p cards) a  
> PowerMac 8500, 9600, 9650, G3 Desktop, G3 B&W and G4.
> 
> I have echo problem on all of them. I even tried on different OS.  
> Fedora Core 1, 2 and 3 for the PCs and Yellow Dog Linux 3.01 and 4.0  
> for the Macs. I even tried the Clipcomm CG-410 on OS X (10.2.8,  10.3.x 
> and even 10.4)
> 
> I'm using Cisco IP Phone 7960 with SIP firmware 7.3 and a few  
> Granstream GXP-2000. The echo is a lot worst on Cisco phones.
> 
> Now I just ordered 5 Sipura 3000 to see if that will remove the echo.  I 
> can't understand why it wouldn't work with the Digium cards...
> 
> If someone has a clue to help me figure out how to remove this echo  
> well let me know as right now I'm considering that all Digium cards  
> sucks... For Clipcomm well the echo was there and I can't get Caller  ID 
> to work so it's useless...
> 
> Thanks
> 
> Martin
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