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

Helmut Kuper helmut.kuper at ewetel.de
Fri May 14 06:53:20 PDT 2010

Hello, erm, Krzysztof (?) (broke my eyes first, then my tongue and at 
last my fingers :D :D ;-) )

well I use FS simply as a (G711a) passthrough gateway to good old analog 
fax devices connected via ATAs to FS. Bitrates are < 14400. Quite 
simple, works currently, but have to waive the HEC, until I tried the 
workaround. I will have in the end up to 60 fax devices, maybe a 
dedicated machine is needed then. But currently I have only two devices.


On 14.05.2010 11:31, Krzysztof Drewicz wrote:
> 2010/5/14 Helmut Kuper<helmut.kuper at ewetel.de>:
>> Hello Moises,
>> thx. Well I saw a hint for noise reduction capabilities of A104d
>> somewhere in the logs during debugging. And it's easy to suppose that
>> fax data could be interpreted as noise. On the other hand I'm a bit
>> confused because the Fax is transmitted in a digital way, so where
>> should the noise comes from (except the quantization noise).
> Noise could come from analog line "on the other side", for example
> this is 2 phones (one being facsimile machine) put in parallel to one
> pair of copper line.
> I run some big faxserver farm (like having 20+ channels up most of the
> 9-17 on one machine and having two machines in two different
> locations)  and prefer to use some openvox cards without any EC
> (hardware or software). with A102d i had some problems that caused
> need to reboot server with a reset button every two-three weeks.
> btw: i use dedicated machine just for faxing, for you disable 'on
> demant' might work better.
> what software you use for fax? (iaxmodem/ t38modem + hylafax or you do
> faxes in FS ?) and what speed you manage to get (14 400 bps or some
> more)?
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