[Freeswitch-users] mod_openzap, sangoma, FAX and HW-HEC

[Moises Silva]

It is implemented and should work as a work-around.

Having said that, I suggest you to contact Sangoma support (
techdesk at sangoma.com), the ec chip should detect fax tone and disable its
echo-canceling functions. However, some old versions of the driver have a
noise-reduction feature enabled by default which also happen to disrupt
faxes.

Try adding this just below TDMV_HWEC=YES option:

HWEC_NOISE_REDUCTION_DISABLE=YES

Or upgrade to the latest driver which does this automatically.

Moises Silva
Senior Software Engineer
Sangoma Technologies Inc. | 50 McIntosh Drive, Suite 120, Markham ON L3R 9T3
Canada
t. 1 905 474 1990 x 128 | e. moy at sangoma.com


On Wed, May 12, 2010 at 1:24 PM, Anthony Minessale <
anthony.minessale at gmail.com> wrote:

> openzap has an app you can run to disable EC but i don't know if it's
> implemented into the sangoma plugin but its not hard to fix if it's not.
>
>
> On Wed, May 12, 2010 at 11:47 AM, Helmut Kuper <helmut.kuper at ewetel.de>wrote:
>
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>> Hello,
>>
>>
>> I'm not sure whether I'm right here or not. But maybe someone has faced
>> same problem:
>>
>>
>> Scenario A:
>> I'm using Sangoma A104d and FreeSWITCH Version 1.0.head (17097:17188M).
>> I enabled hardware based detection of fax and dtmf. Further hardware
>> based HEC is enabled
>>
>> I'm not able to reveive a FAX (analog) via PSTN, while sending works and
>> internal (SIP) works as well. So there is no problem with the ATAs I use
>> nor with the network (which routes the RTP along 80 kilometers one way).
>>
>> Scenario B:
>> I'm able to receive FAX from pstn with same setup, but have hardware
>> based HEC disabled. So in this case everything works fine.
>>
>>
>> I thought sangoma's hardware based Fax detection feature should have
>> disabled HEC when a Fax is detected, but it doesn't seems so. So my
>> current thoughts are about the question whether FS is able to disable
>> hardware HEC via mod_openzap and wanpipe driver for the corresponding
>> A104d channel, when FS knows that the target is a FAX device ...
>>
>>
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>
>
>
> --
> Anthony Minessale II
>
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