It is implemented and should work as a work-around. Having said that, I suggest you to contact Sangoma support ( techdesk@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@sangoma.com On Wed, May 12, 2010 at 1:24 PM, Anthony Minessale < anthony.minessale@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@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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