-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 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 ... -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (MingW32) iD8DBQFL6tu84tZeNddg3dwRAur3AJ4rOw5ocXm+aGG7spLYtA4yx23eHACfcUPF K+VHsbNiCR0XQeztzeI4iTY= =ihsg -----END PGP SIGNATURE-----
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:
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
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 ...
-----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (MingW32)
iD8DBQFL6tu84tZeNddg3dwRAur3AJ4rOw5ocXm+aGG7spLYtA4yx23eHACfcUPF K+VHsbNiCR0XQeztzeI4iTY= =ihsg -----END PGP SIGNATURE-----
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-- Anthony Minessale II FreeSWITCH http://www.freeswitch.org/ ClueCon http://www.cluecon.com/ Twitter: http://twitter.com/FreeSWITCH_wire AIM: anthm MSN:anthony_minessale@hotmail.com <MSN%3Aanthony_minessale@hotmail.com> GTALK/JABBER/PAYPAL:anthony.minessale@gmail.com<PAYPAL%3Aanthony.minessale@gmail.com> IRC: irc.freenode.net #freeswitch FreeSWITCH Developer Conference sip:888@conference.freeswitch.org <sip%3A888@conference.freeswitch.org> googletalk:conf+888@conference.freeswitch.org<googletalk%3Aconf%2B888@conference.freeswitch.org> pstn:+19193869900
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:
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
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 ...
-----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (MingW32)
iD8DBQFL6tu84tZeNddg3dwRAur3AJ4rOw5ocXm+aGG7spLYtA4yx23eHACfcUPF K+VHsbNiCR0XQeztzeI4iTY= =ihsg -----END PGP SIGNATURE-----
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-- Anthony Minessale II
FreeSWITCH http://www.freeswitch.org/ ClueCon http://www.cluecon.com/ Twitter: http://twitter.com/FreeSWITCH_wire
AIM: anthm MSN:anthony_minessale@hotmail.com <MSN%3Aanthony_minessale@hotmail.com> GTALK/JABBER/PAYPAL:anthony.minessale@gmail.com<PAYPAL%3Aanthony.minessale@gmail.com> IRC: irc.freenode.net #freeswitch
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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@sangoma.com On Wed, May 12, 2010 at 3:40 PM, Moises Silva <moises.silva@gmail.com>wrote:
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:
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
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 ...
-----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (MingW32)
iD8DBQFL6tu84tZeNddg3dwRAur3AJ4rOw5ocXm+aGG7spLYtA4yx23eHACfcUPF K+VHsbNiCR0XQeztzeI4iTY= =ihsg -----END PGP SIGNATURE-----
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-- Anthony Minessale II
FreeSWITCH http://www.freeswitch.org/ ClueCon http://www.cluecon.com/ Twitter: http://twitter.com/FreeSWITCH_wire
AIM: anthm MSN:anthony_minessale@hotmail.com <MSN%3Aanthony_minessale@hotmail.com> GTALK/JABBER/PAYPAL:anthony.minessale@gmail.com<PAYPAL%3Aanthony.minessale@gmail.com> IRC: irc.freenode.net #freeswitch
FreeSWITCH Developer Conference sip:888@conference.freeswitch.org <sip%3A888@conference.freeswitch.org> googletalk:conf+888@conference.freeswitch.org<googletalk%3Aconf%2B888@conference.freeswitch.org> pstn:+19193869900
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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). Oh, and I use wanpipe "WANPIPE Release: 3.5.10". Is this version already too old? I will try to activated this new work around to disable HEC per channel on demand. Thx alot to both of you. regards helmut On 12.05.2010 21:47, 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@sangoma.com <mailto:moy@sangoma.com>
2010/5/14 Helmut Kuper <helmut.kuper@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)?
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. regards helmut On 14.05.2010 11:31, Krzysztof Drewicz wrote:
2010/5/14 Helmut Kuper<helmut.kuper@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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3.5.10 is not an old version, but the noise reduction is disabled by default starting with 3.5.11 according to the change log. 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 Fri, May 14, 2010 at 2:12 AM, Helmut Kuper <helmut.kuper@ewetel.de>wrote:
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).
Oh, and I use wanpipe "WANPIPE Release: 3.5.10". Is this version already too old?
I will try to activated this new work around to disable HEC per channel on demand.
Thx alot to both of you.
regards helmut
On 12.05.2010 21:47, 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@sangoma.com <mailto:moy@sangoma.com>
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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@sangoma.com <mailto:moy@sangoma.com>
On Wed, May 12, 2010 at 3:40 PM, Moises Silva <moises.silva@gmail.com <mailto:moises.silva@gmail.com>> wrote:
It is implemented and should work as a work-around.
Having said that, I suggest you to contact Sangoma support (techdesk@sangoma.com <mailto: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.
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@sangoma.com On Fri, May 14, 2010 at 9:22 AM, Steve Underwood <steveu@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@sangoma.com <mailto:moy@sangoma.com>
On Wed, May 12, 2010 at 3:40 PM, Moises Silva <moises.silva@gmail.com <mailto:moises.silva@gmail.com>> wrote:
It is implemented and should work as a work-around.
Having said that, I suggest you to contact Sangoma support (techdesk@sangoma.com <mailto: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.
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participants (5)
-
Anthony Minessale
-
Helmut Kuper
-
Krzysztof Drewicz
-
Moises Silva
-
Steve Underwood