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

[Moises Silva]

No I don't have any idea of what the octasic chip does exactly when that
setting is enabled. Nenad disabled that setting by default starting with
driver 3.5.11 since indeed was related to many fax problems.

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 Fri, May 14, 2010 at 9:22 AM, Steve Underwood <steveu at coppice.org> wrote:

> Hi Moises,
>
> Do you know exactly what the noise reduction does? In an echo canceller
> context I can see a couple of possibilities. I think all of them are
> pretty horrible for what they might do to modem signals. Maybe this has
> something to do with why so many people have problems with both Sangoma
> and Digium boards that use the Octasic echo cancellers.
>
> Steve
>
>
> On 05/13/2010 03:47 AM, Moises Silva wrote:
> > Sorry, the setting should be under [wanpipex] in wanpipex.conf file
> > and NOT in the [wxgx] section.
> >
> > 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 <mailto:moy at sangoma.com>
> >
> >
> > On Wed, May 12, 2010 at 3:40 PM, Moises Silva <moises.silva at gmail.com
> > <mailto:moises.silva at gmail.com>> wrote:
> >
> >     It is implemented and should work as a work-around.
> >
> >     Having said that, I suggest you to contact Sangoma support
> >     (techdesk at sangoma.com <mailto: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.
> >
>
>
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