[Asterisk-Users] Echo problem

[Jon Califf]

I use Digium TDM400 cards as well. Asterisk's software echo cancellation
sucks. From what I've heard on the IRC channel, you'll never completely
eliminate echo with it. And unfortunately, hardware echo cancellation starts
out at a full T1. They don't seem to have any solution for someone with 4
pots lines like myself. 

I haven't been able to completely eliminate echo, but I've come close by
using the following:

echocancel=64
echocancelwhenbridged=no
echotraining=800
rxgain=4.5
txgain=0.0

echocancel=64 was significantly better than echocancel=128 (supposedly the
same setting you get when you use echocancel=yes)

echotraining at 400 was too short, but 800 seems to almost completely
eliminate any initial echo. Occasionally there is still a little echo to
start with, but it isn't very bad and it goes away quickly.

What sort of echo are you getting? Loud, quiet, fades in and out, starts
halfway through the call, starts loud and gets quit?

Jon


-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Martin Roy
Sent: Wednesday, June 08, 2005 10:37 AM
To: asterisk-users at lists.digium.com
Subject: [Asterisk-Users] Echo problem

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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