asterisk users - Sep 2010 - Echo on Sangoma A400 and background noise

I'm a long time user of Digium carts and stupid me i wanted to give Sangoma
a try.
We got Sangoma A400 with 6 FXO ports.

Asterisk version: 1.4.35
Zaptel version: 1.4.11
Wanpipe version: 3.5.11

we tried to use fxtune but looks like it wont work with Sangoma card, (
please correct me if i'm wrong)
Echo is really bad and also we have  background noise on all lines.
We tried both mg2 and oslec echo canceler.
was wondering if you have any experiense with that because Sangoma tech
support is not helpfull, just look at their response:

"As you mentioned you have tried Oslec algorithms for echo
cancellation.Which
is a  good way to solve echo cancellation issues. If that is not woking for
you you may want to upgrade to hardware echo cancellation......with cards
which have echo cancellers.


Hope this helps.

-Sri"
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----- "Al lists" <asteriskal at gmail.com> wrote:
> I'm a long time user of Digium carts and stupid me i wanted to give
Sangoma a try.
> We got Sangoma A400 with 6 FXO ports. 
> 
> Asterisk version: 1.4.35 
> Zaptel version: 1.4.11 
> Wanpipe version: 3.5.11 
> 
> we tried to use fxtune but looks like it wont work with Sangoma card, (
please correct me if i'm wrong)
> Echo is really bad and also we have background noise on all lines. 
> We tried both mg2 and oslec echo canceler. 
> was wondering if you have any experiense with that because Sangoma tech
support is not helpfull, just look at their response:
> 
> "As you mentioned you have tried Oslec algorithms for echo
cancellation.Which
> is a good way to solve echo cancellation issues. If that is not woking for 
> you you may want to upgrade to hardware echo cancellation......with cards 
> which have echo cancellers. 
> 

I've had the exact opposite experience you've had. Digium tech support
was less than stellar whereas Sangoma has always been top-notch.


Also, their cards with HWEC 'just work' with absolutely no tuning
required.

--Tim 
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On Sep 15, 2010, at 6:10 PM, Al lists wrote:
> we tried to use fxtune but looks like it wont work with Sangoma  
> card, ( please correct me if i'm wrong)
> Echo is really bad and also we have  background noise on all lines.
> We tried both mg2 and oslec echo canceler.

I've only used Sangoma with hardware echo cancelation, but I did find  
I had to manually tune my cards. In my case using a test tone number  
was of no help, rather I just listened in on calls in progress and  
used ztmonitor to see where the levels were and adjusted things until  
I had a good level and the sound quality was acceptable.

Until I did the manual tuning I had serious issues of static and  
background noise on several lines, but not all. I don't blame this on  
the Sangoma card, but rather on the line quality as I run Sangomas in  
other locations and have never had to do any tuning there, they have  
just worked.

-chris
<www.mythtech.net>

On Wed, Sep 15, 2010 at 6:10 PM, Al lists <asteriskal at gmail.com> wrote:
> I'm a long time user of Digium carts and stupid me i wanted to give
Sangoma
> a try.
> We got Sangoma A400 with 6 FXO ports.
>
> Asterisk version: 1.4.35
> Zaptel version: 1.4.11
> Wanpipe version: 3.5.11
>
> we tried to use fxtune but looks like it wont work with Sangoma card, (
> please correct me if i'm wrong)
> Echo is really bad and also we have  background noise on all lines.
> We tried both mg2 and oslec echo canceler.
> was wondering if you have any experiense with that because Sangoma tech
> support is not helpfull, just look at their response:
>
Hello,

I am sorry you've had this bad experience and I apologize on behalf of
Sangoma if we gave you the impression of not caring about your technical
issue.

To rephrase what tech support meant. Our HWEC is known to provide better
results, but in no way that means that we will not look at your issue with
the card that does not have HWEC.

A senior tech support engineer will be contacting you soon today to follow
up on your issue appropriately.

Regards,

Moises Silva
Senior Software Engineer
Sangoma Technologies Inc. | NEW 100 Renfrew Drive, Suite 100, Markham ON L3R
9R6 Canada
t. 1 905 474 1990 x128 | e. moy at sangoma.com
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