Re: [Astlinux-users] Faxing to and from Astlinux using T.38

[David Kerr]

I have my dialplan set to receive faxes if it detects the fax tone.  I use
the ReceiveFax() dialplan application which then emails me a PDF file.  I
use it only very very occasionally but it seems to work.  Sending fax is
possible but somehow you have to get the document into TIFF format which is
not easy and so I have not bothered to set that up.  For the few times I
need to fax something reliably I use one of the online email-to-fax
suppliers some of which will let you do the occasional fax free of charge.

Finally, I have a multi-function printer connected to a ATA to my Asterisk
server and it has fax capability.  However it is not at all reliable.  If
all I do is fax to the ReceiveFax() application on my asterisk server then
it works great.  But if I try and fax out over a VoIP provider to a 3rd
party fax machine then all bets are off.  Sometimes it works, sometimes it
doesn't.  Sometimes it claims to have worked (fax status OK) but other
party says it arrived corrupted.  Bottom line... Analog Fax and VoIP do not
mix well.

David
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Re: [Astlinux-users] Faxing to and from Astlinux using T.38

[Michael Keuter]

> Am 12.12.2016 um 11:29 schrieb Michael Knill 
> <michael.kn...@ipcsolutions.com.au>:
> 
> Thanks Michael
> 
> It looks a bit too hard ☹
> 
> Regards
> Michael Knill

Yes. For a company which really relies on sending many faxes per day, I would 
not try to use this.

For companies which occasionally receive a few faxes, the Asterisk solution 
works fine.
I sometimes use that in conjunction with a Cisco SPA112 ATA for sending.

> -Original Message-
> From: Michael Keuter <li...@mksolutions.info>
> Reply-To: AstLinux List <astlinux-users@lists.sourceforge.net>
> Date: Monday, 12 December 2016 at 9:08 PM
> To: AstLinux List <astlinux-users@lists.sourceforge.net>
> Subject: Re: [Astlinux-users] Faxing to and from Astlinux using T.38
> 
> 
>> Am 12.12.2016 um 08:11 schrieb Michael Knill 
>> <michael.kn...@ipcsolutions.com.au>:
>> 
>> Has anyone done this? Im looking (begrudgingly) at setting up a fax server.
>> 
>> Regards
>> Michael Knill
> 
> Receiving faxes with Asterisk is relatively simple: you can convert the 
> incoming tiff document with "tiff2pdf" to an PDF document and send it via 
> email to the recipient (like voicemail).
> The other way is much harder, as there is no (small) pdf2tiff.
> 
> You would need the full Ghostscript suite or something similar big to convert 
> from pdf to tiff.
> And you would somehow need to upload the fax document to Asterisk.
> 
> Another way to send would be the T38printer (Windows-only):
> https://www.t38printer.de/typo3/home/
> 
> Not every VoIP-ISP does support T.38, the biggest ones here in Germany do not.
> 
> Michael

Michael

http://www.mksolutions.info




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Re: [Astlinux-users] Faxing to and from Astlinux using T.38

[Michael Knill]

Thanks Michael

It looks a bit too hard ☹

Regards
Michael Knill

-Original Message-
From: Michael Keuter <li...@mksolutions.info>
Reply-To: AstLinux List <astlinux-users@lists.sourceforge.net>
Date: Monday, 12 December 2016 at 9:08 PM
To: AstLinux List <astlinux-users@lists.sourceforge.net>
Subject: Re: [Astlinux-users] Faxing to and from Astlinux using T.38


> Am 12.12.2016 um 08:11 schrieb Michael Knill 
> <michael.kn...@ipcsolutions.com.au>:
> 
> Has anyone done this? Im looking (begrudgingly) at setting up a fax server.
> 
> Regards
> Michael Knill

Receiving faxes with Asterisk is relatively simple: you can convert the 
incoming tiff document with "tiff2pdf" to an PDF document and send it via email 
to the recipient (like voicemail).
The other way is much harder, as there is no (small) pdf2tiff.

You would need the full Ghostscript suite or something similar big to convert 
from pdf to tiff.
And you would somehow need to upload the fax document to Asterisk.

Another way to send would be the T38printer (Windows-only):
https://www.t38printer.de/typo3/home/

Not every VoIP-ISP does support T.38, the biggest ones here in Germany do not.

Michael

http://www.mksolutions.info




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Re: [Astlinux-users] Faxing to and from Astlinux using T.38

[Michael Keuter]

> Am 12.12.2016 um 08:11 schrieb Michael Knill 
> :
> 
> Has anyone done this? Im looking (begrudgingly) at setting up a fax server.
> 
> Regards
> Michael Knill

Receiving faxes with Asterisk is relatively simple: you can convert the 
incoming tiff document with "tiff2pdf" to an PDF document and send it via email 
to the recipient (like voicemail).
The other way is much harder, as there is no (small) pdf2tiff.

You would need the full Ghostscript suite or something similar big to convert 
from pdf to tiff.
And you would somehow need to upload the fax document to Asterisk.

Another way to send would be the T38printer (Windows-only):
https://www.t38printer.de/typo3/home/

Not every VoIP-ISP does support T.38, the biggest ones here in Germany do not.

Michael

http://www.mksolutions.info




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[Astlinux-users] Faxing to and from Astlinux using T.38

[Michael Knill]

Has anyone done this? Im looking (begrudgingly) at setting up a fax server.

Regards
Michael Knill

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Re: [Astlinux-users] faxing

[Michael Keuter]

Am 30.01.2012 um 04:05 schrieb Tim Nelson:

 
 - Original Message -
 My experience with spandsp was a bit different. I had quite a few
 issues with spandsp and since I moved to Digium Fax I have not had any
 issues.
 I kept the built in res_fax and just used noload for res_fax_spanddsp
 
 
 Can you provide details on what specific issues you had with SpanDSP that 
 were fixed by using the Digium module? Not trying to be confrontational, just 
 genuinely curious about your experiences.
 
 --Tim


Just for your info: 

the latest spandsp version 0.0.6pre19 from January 2012 will be included in the 
upcoming Astlinux 1.0.2 version.

Michael

http://www.mksolutions.info





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Re: [Astlinux-users] faxing

[Tim Nelson]

- Original Message -
 My experience with spandsp was a bit different. I had quite a few
 issues with spandsp and since I moved to Digium Fax I have not had any
 issues.
 I kept the built in res_fax and just used noload for res_fax_spanddsp
 

Can you provide details on what specific issues you had with SpanDSP that were 
fixed by using the Digium module? Not trying to be confrontational, just 
genuinely curious about your experiences.

--Tim

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Re: [Astlinux-users] faxing

[David Kerr]

I successfully installed the free Fax for Asterisk from Digium today on my
Alix 2c3.  Digium's instructions worked well but there were two hiccups...

1) There is a benchfax application that is supposed to determine the best
flavor of binary file to download. It tested for generic i686' then
skipped a few as not compatible, then got segfault message.  Of the two
tests that ran i686 was marginally faster, so that is the version I
downloaded.

2) On untar'ing the module I got message that I was out of space on the
device.  I was in /root which I think is ramdisk.  I erased the benchfax
application and that freed up enough space.

After installing res_fax_digium.so into the modules directory I removed
(renamed) res_fax_spandsp.so so that both would not load. I'm not sure what
would happen if both modules were loaded -- which one would Asterisk use on
receiving a fax?

I restarted Asterisk, checked that the digium fax module was loaded and I
had license for one channel. Then I sent myself a fax and it worked
(Asterisk received it) using exactly the same dialplan that I had been
using with spandsp.

On the assumption that Digium's Fax for Asterisk is somehow superior to
spandsp I'll stick with this configuration.  Does anyone know the
differences (appart from module file size... digium's is way way way
larger).

David.


On Wed, Jan 25, 2012 at 1:33 PM, Fernando F. digitaldis...@gmail.comwrote:

 Is there a way I can use Asterisk fax on astlinux?
 spandsp does not work well on my system.

 Thank You,

 Fernando Fuentes
 DIGITALVOIPNET.COM




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Re: [Astlinux-users] faxing

[Lonnie Abelbeck]

Nice example David !

Though, rather then removing/renaming res_fax_spandsp.so, using noload = 
res_fax_spandsp.so in /etc/asterisk/modules.conf would be the proper method.  
(You can use show-union to see the 
/oldroot/mnt/asturw/usr/lib/asterisk/modules/res_fax_spandsp.so (.wh., etc.) 
that could be removed to return your res_fax_spandsp.so file.)

Possibly having both res_fax_spandsp.so and res_fax_digium.so would still work? 
it would be good to test that.  At least use noload to disable.

We should put together a wiki entry for this after we get the details ironed 
out.

Great to hear this works.  Nice to know glibc binary support is useful. :-)

Lonnie


On Jan 28, 2012, at 4:51 PM, David Kerr wrote:

 I successfully installed the free Fax for Asterisk from Digium today on my 
 Alix 2c3.  Digium's instructions worked well but there were two hiccups...
 
 1) There is a benchfax application that is supposed to determine the best 
 flavor of binary file to download. It tested for generic i686' then 
 skipped a few as not compatible, then got segfault message.  Of the two tests 
 that ran i686 was marginally faster, so that is the version I downloaded.
 
 2) On untar'ing the module I got message that I was out of space on the 
 device.  I was in /root which I think is ramdisk.  I erased the benchfax 
 application and that freed up enough space.
 
 After installing res_fax_digium.so into the modules directory I removed 
 (renamed) res_fax_spandsp.so so that both would not load. I'm not sure what 
 would happen if both modules were loaded -- which one would Asterisk use on 
 receiving a fax? 
 
 I restarted Asterisk, checked that the digium fax module was loaded and I had 
 license for one channel. Then I sent myself a fax and it worked (Asterisk 
 received it) using exactly the same dialplan that I had been using with 
 spandsp.
 
 On the assumption that Digium's Fax for Asterisk is somehow superior to 
 spandsp I'll stick with this configuration.  Does anyone know the differences 
 (appart from module file size... digium's is way way way larger).
 
 David.
 
 
 On Wed, Jan 25, 2012 at 1:33 PM, Fernando F. digitaldis...@gmail.com wrote:
 Is there a way I can use Asterisk fax on astlinux?
 spandsp does not work well on my system.
 
 Thank You,
 
 Fernando Fuentes
 DIGITALVOIPNET.COM

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Re: [Astlinux-users] faxing

[Tim Nelson]

- Original Message -
 
 On the assumption that Digium's Fax for Asterisk is somehow superior
 to spandsp I'll stick with this configuration. Does anyone know the
 differences (appart from module file size... digium's is way way way
 larger).
 

Digium's fax implementation comes from Commetrex, whereas SpanDSP is an open 
source fax library. I suppose there are arguments for both, but in my testing, 
and usage in real-world scenarios, the SpanDSP T.30 and T.38 implementation is 
much more reliable, and handles many edge cases with grace. YMMV

--Tim

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Re: [Astlinux-users] faxing

[Fernando F.]

My experience with spandsp was a bit different. I had quite a few issues
with spandsp and since I moved to Digium Fax I have not had any issues.
I kept the built in res_fax and just used noload for res_fax_spanddsp

Thank You,

Fernando Fuentes
DIGITALVOIPNET.COM




On Sat, Jan 28, 2012 at 6:54 PM, Tim Nelson tnel...@rockbochs.com wrote:


 - Original Message -
 
  On the assumption that Digium's Fax for Asterisk is somehow superior
  to spandsp I'll stick with this configuration. Does anyone know the
  differences (appart from module file size... digium's is way way way
  larger).
 

 Digium's fax implementation comes from Commetrex, whereas SpanDSP is an
 open source fax library. I suppose there are arguments for both, but in my
 testing, and usage in real-world scenarios, the SpanDSP T.30 and T.38
 implementation is much more reliable, and handles many edge cases with
 grace. YMMV

 --Tim


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[Astlinux-users] faxing

[Fernando F.]

Is there a way I can use Asterisk fax on astlinux?
spandsp does not work well on my system.

Thank You,

Fernando Fuentes
DIGITALVOIPNET.COM
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Re: [Astlinux-users] faxing

[Michael Keuter]

Am 25.01.2012 um 19:33 schrieb Fernando F.:

 Is there a way I can use Asterisk fax on astlinux?
 spandsp does not work well on my system.
 
 Thank You,
 
 Fernando Fuentes
 DIGITALVOIPNET.COM

I would start here:
http://www.digium.com/en/products/software/faxforasterisk.php#overview

AstLinux 1.0.x is now glibc compatible, so you could directly use the Digium 
binaries.
When I remember right, did Lonnie try the G.729 codec on a net5501 a while ago. 
So Fax should also work.

Michael

http://www.mksolutions.info





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Re: [Astlinux-users] Faxing

[Philip Prindeville]

Yes.  You should have absolutely no jitter issues and it should be 
brilliant (assuming you never peg your internal LAN with massive 
transfers that saturate your network).



On 5/27/10 7:35 AM, Tom Chadwin wrote:
As always, I needed to be clearer in my description. Our only trunking 
is ISDN PRI. We are only using SIP/IAX internally. So, would a PAP2T 
(various of which I currently use for voice) work well as the bridge 
between our internal analogue fax and our internal Astlinux box, 
sending and receiving faxes externally via ISDN?

Thanks
Tom



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Re: [Astlinux-users] Faxing

[Chris Abnett]

I have pretty good luck faxing through the Adtran TotalAccess series
devices..  These devices do provide positive disconnect on their analog
lines.  plus they are a full featured device that I use for multiple
purposes on each site..

They are a bit tricky to get working with asterisk  but they do work great
once you get them set up. you can set a straight modem passthrough mode
which it detects and alters the codecs, echo cancellers, etc for pretty
reliable transmission without using T.38. or you can use T.38 weith pretty
good success.

The biggest issues with T.38 come down to the timing delays and issues with
multiple network hops..  esp if somewhere along the lines a T.38 aware
device in between decodes the T.38 and re-encodes it.. you are done then..

-Christopher

 

From: James Babiak [mailto:jfbab...@gmail.com] 
Sent: Friday, May 28, 2010 8:38 AM
To: AstLinux Users Mailing List
Subject: Re: [Astlinux-users] Faxing

 

To throw in my two cents, we've used SPA3102s that would register directly
to a remote 'fax' server using T.38 with limited success. Seems like the
majority of fax machines would work the majority of time, but only on short
faxes (less then a few pages). The more pages you sent, the failure rate
went up dramatically. We then looked at AudioCodes devices. The MP2XX series
proved to be much more stable then the SPAs. On the SPAs, we had to make
changes on most fax machines (disable ECM, lower speed to 14.4kbps or less)
that we did not need to make on the AC. In addition, certain fax machines
that we could never get working on the SPAs worked great without any tweaks
on the ACs. So we're using the MP201,202,204 and even 208 for fax ATAs now.
My only pet peeve is that they do not provide any CPC loop disconnect. Even
the Crapstream ATAs would do this. All they can do is play a tone that
defaults to a fast busy but is user selectable. Has caused problems with a
few PBX systems. AudioCodes says they are working on a firmware fix for this
as the hardware supports it. Until that time, we are looking at the better,
albeit more expensive, 100 series which provides it out of the box.

Personally, I've tested out faxes using an old Sunrocket ATA and G711, and
actually had some limited success with that as well.

-James

Tod Fitch wrote: 

If your VoIP provider is setup for T.38 then you may have an issue. For
in-bound faxes you are in control: If you don't allow T.38 then it will stay
with whatever codec you have negotiated. Which should be g711. For out-bound
faxes you are at the mercy of your VoIP provider's setup. The receiving
(provider's) side of the VoIP connection can detect that a fax is being sent
and attempt a re-invite using T.38. 

 

The PAP2T does not support T.38.

 

I switched to using a Grandstream HT502 which claims support for T.38 but
still haven't gotten it to work through my Astlinux box. My provider claims
better operation if you have the ATA directly register with them. The
Asterisk logging with debug on claims a rejected codec but I don't know if
that is Asterisk complaining or if it is my ATA. I haven't yet bothered
looking at the traffic with Wireshark to figure out exactly what is going
on.

 

Net result: If your provider does not do T.38 then you can probably get
faxes to work using the g711 codec. I have maybe a 95% fax success rate with
that type of operation. Not good enough for a heavy business use but good
enough for my needs. If the provider re-invites to T.38 then you may have a
0% success rate (my experience). I believe that the specs call for graceful
fall back to the voice codec if the T.38 invite fails but I haven't seen
that happen (two different VoIP providers). If anyone knows how to get this
to work I would dearly like to know.


-Tod





 

On May 27, 2010, at 6:34 AM, David Kerr wrote:





I should add that the PAP2T I have is one that I got through Nextalarm.com
which is customized to support alarm/security system monitoring over the
internet (VoIP). The ATA is customized to connect one of the analog lines
into their systems, the other line is available to configure for my own use
(after you get the admin password from them).  I mention this because it is
possible that the customization included work to improve the A to D
conversion process, not just hard wiring one of the lines to nextalarm's
systems... 

https://nextalarm.com/do/customer/productDetail?id=17

 

David

On Thu, May 27, 2010 at 9:28 AM, David Kerr da...@kerr.net wrote:

The answer is it depends.  I have had success with a fax machine connected
to a linksys PAP2T ATA and routing through vitelity as the SIP trunk
provider (with Astlinux in-between).  I have had complete failure with an
older Linksys/Sipura SPA-2002 and the same SIP trunk. 

 

I have both a PAP2T and SPA-2002 connected to my system and the audio
quality is noticeably better on the PAP2T.  In particular there is a lot of
background hiss from the SPA-2002 that is not present on the PAP2T.  That
may also suggest

Re: [Astlinux-users] Faxing

[Tom Chadwin]

Goodness. Thanks so much, everyone, for such a huge quantity of information.
I'll start off testing the PAP2T, as I have one already. If that doesn't
work, I'll try the berofix mailing list, as I have a spare BRI module, I
think. Failing that, I evidently have a large number of alternative
approaches.
 
Again, thanks everyone
 
Tom
 


  _  

From: Chris Abnett [mailto:eldorado...@yahoo.com] 
Sent: 28 May 2010 14:11
To: 'AstLinux Users Mailing List'
Subject: Re: [Astlinux-users] Faxing



I have pretty good luck faxing through the Adtran TotalAccess series
devices..  These devices do provide positive disconnect on their analog
lines.  plus they are a full featured device that I use for multiple
purposes on each site..

They are a bit tricky to get working with asterisk  but they do work great
once you get them set up. you can set a straight modem passthrough mode
which it detects and alters the codecs, echo cancellers, etc for pretty
reliable transmission without using T.38. or you can use T.38 weith pretty
good success.

The biggest issues with T.38 come down to the timing delays and issues with
multiple network hops..  esp if somewhere along the lines a T.38 aware
device in between decodes the T.38 and re-encodes it.. you are done then..

-Christopher

 

From: James Babiak [mailto:jfbab...@gmail.com] 
Sent: Friday, May 28, 2010 8:38 AM
To: AstLinux Users Mailing List
Subject: Re: [Astlinux-users] Faxing

 

To throw in my two cents, we've used SPA3102s that would register directly
to a remote 'fax' server using T.38 with limited success. Seems like the
majority of fax machines would work the majority of time, but only on short
faxes (less then a few pages). The more pages you sent, the failure rate
went up dramatically. We then looked at AudioCodes devices. The MP2XX series
proved to be much more stable then the SPAs. On the SPAs, we had to make
changes on most fax machines (disable ECM, lower speed to 14.4kbps or less)
that we did not need to make on the AC. In addition, certain fax machines
that we could never get working on the SPAs worked great without any tweaks
on the ACs. So we're using the MP201,202,204 and even 208 for fax ATAs now.
My only pet peeve is that they do not provide any CPC loop disconnect. Even
the Crapstream ATAs would do this. All they can do is play a tone that
defaults to a fast busy but is user selectable. Has caused problems with a
few PBX systems. AudioCodes says they are working on a firmware fix for this
as the hardware supports it. Until that time, we are looking at the better,
albeit more expensive, 100 series which provides it out of the box.

Personally, I've tested out faxes using an old Sunrocket ATA and G711, and
actually had some limited success with that as well.

-James

Tod Fitch wrote: 

If your VoIP provider is setup for T.38 then you may have an issue. For
in-bound faxes you are in control: If you don't allow T.38 then it will stay
with whatever codec you have negotiated. Which should be g711. For out-bound
faxes you are at the mercy of your VoIP provider's setup. The receiving
(provider's) side of the VoIP connection can detect that a fax is being sent
and attempt a re-invite using T.38. 

 

The PAP2T does not support T.38.

 

I switched to using a Grandstream HT502 which claims support for T.38 but
still haven't gotten it to work through my Astlinux box. My provider claims
better operation if you have the ATA directly register with them. The
Asterisk logging with debug on claims a rejected codec but I don't know if
that is Asterisk complaining or if it is my ATA. I haven't yet bothered
looking at the traffic with Wireshark to figure out exactly what is going
on.

 

Net result: If your provider does not do T.38 then you can probably get
faxes to work using the g711 codec. I have maybe a 95% fax success rate with
that type of operation. Not good enough for a heavy business use but good
enough for my needs. If the provider re-invites to T.38 then you may have a
0% success rate (my experience). I believe that the specs call for graceful
fall back to the voice codec if the T.38 invite fails but I haven't seen
that happen (two different VoIP providers). If anyone knows how to get this
to work I would dearly like to know.


-Tod





 

On May 27, 2010, at 6:34 AM, David Kerr wrote:





I should add that the PAP2T I have is one that I got through Nextalarm.com
which is customized to support alarm/security system monitoring over the
internet (VoIP). The ATA is customized to connect one of the analog lines
into their systems, the other line is available to configure for my own use
(after you get the admin password from them).  I mention this because it is
possible that the customization included work to improve the A to D
conversion process, not just hard wiring one of the lines to nextalarm's
systems... 

https://nextalarm.com/do/customer/productDetail?id=17

 

David

On Thu, May 27, 2010 at 9:28 AM, David Kerr da...@kerr.net wrote:

The answer

[Astlinux-users] Faxing

[Tom Chadwin]

Slightly OT...

With an uncustomized 0.7.2 (1.4) on a net5501 with a berofix PRI, what is
the easiest way to attach an analogue fax which currently uses one DDI on
the UK PRI? Will an ATA work?

Thanks

Tom


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Re: [Astlinux-users] Faxing

[David Kerr]

The answer is it depends.  I have had success with a fax machine connected
to a linksys PAP2T ATA and routing through vitelity as the SIP trunk
provider (with Astlinux in-between).  I have had complete failure with an
older Linksys/Sipura SPA-2002 and the same SIP trunk.

I have both a PAP2T and SPA-2002 connected to my system and the audio
quality is noticeably better on the PAP2T.  In particular there is a lot of
background hiss from the SPA-2002 that is not present on the PAP2T.  That
may also suggest that the dynamic range of the SPA-2002 is not as strong as
the PAP2T.  Both the background hiss and a compressed dynamic range would
explain why analog fax does not work well.

In addition to good A to D conversion, which the PAP2T seems to handle well,
you then have to deal with the characteristics of SIP/VoIP.  You may have to
fiddle with settings like jitter buffer and echo cancelling and you want a
high quality trunk provider.

Good luck.

David


On Thu, May 27, 2010 at 8:17 AM, Tom Chadwin nnpait.servi...@googlemail.com
 wrote:

 Slightly OT...

 With an uncustomized 0.7.2 (1.4) on a net5501 with a berofix PRI, what is
 the easiest way to attach an analogue fax which currently uses one DDI on
 the UK PRI? Will an ATA work?

 Thanks

 Tom



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 Astlinux-users@lists.sourceforge.net
 https://lists.sourceforge.net/lists/listinfo/astlinux-users

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 pay...@krisk.org.

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Re: [Astlinux-users] Faxing

[David Kerr]

I should add that the PAP2T I have is one that I got through Nextalarm.com
which is customized to support alarm/security system monitoring over the
internet (VoIP). The ATA is customized to connect one of the analog lines
into their systems, the other line is available to configure for my own use
(after you get the admin password from them).  I mention this because it is
possible that the customization included work to improve the A to D
conversion process, not just hard wiring one of the lines to nextalarm's
systems...
https://nextalarm.com/do/customer/productDetail?id=17

David

On Thu, May 27, 2010 at 9:28 AM, David Kerr da...@kerr.net wrote:

 The answer is it depends.  I have had success with a fax machine
 connected to a linksys PAP2T ATA and routing through vitelity as the SIP
 trunk provider (with Astlinux in-between).  I have had complete failure with
 an older Linksys/Sipura SPA-2002 and the same SIP trunk.

 I have both a PAP2T and SPA-2002 connected to my system and the audio
 quality is noticeably better on the PAP2T.  In particular there is a lot of
 background hiss from the SPA-2002 that is not present on the PAP2T.  That
 may also suggest that the dynamic range of the SPA-2002 is not as strong as
 the PAP2T.  Both the background hiss and a compressed dynamic range would
 explain why analog fax does not work well.

 In addition to good A to D conversion, which the PAP2T seems to handle
 well, you then have to deal with the characteristics of SIP/VoIP.  You may
 have to fiddle with settings like jitter buffer and echo cancelling and you
 want a high quality trunk provider.

 Good luck.

 David


 On Thu, May 27, 2010 at 8:17 AM, Tom Chadwin 
 nnpait.servi...@googlemail.com wrote:

 Slightly OT...

 With an uncustomized 0.7.2 (1.4) on a net5501 with a berofix PRI, what is
 the easiest way to attach an analogue fax which currently uses one DDI on
 the UK PRI? Will an ATA work?

 Thanks

 Tom



 --

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 Astlinux-users@lists.sourceforge.net
 https://lists.sourceforge.net/lists/listinfo/astlinux-users

 Donations to support AstLinux are graciously accepted via PayPal to
 pay...@krisk.org.



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Re: [Astlinux-users] Faxing

[Tom Chadwin]

As always, I needed to be clearer in my description. Our only trunking is
ISDN PRI. We are only using SIP/IAX internally. So, would a PAP2T (various
of which I currently use for voice) work well as the bridge between our
internal analogue fax and our internal Astlinux box, sending and receiving
faxes externally via ISDN?
 
Thanks
 
Tom
 


  _  

From: David Kerr [mailto:da...@kerr.net] 
Sent: 27 May 2010 14:28
To: tom.chad...@nnpa.org.uk; AstLinux Users Mailing List
Subject: Re: [Astlinux-users] Faxing


The answer is it depends.  I have had success with a fax machine connected
to a linksys PAP2T ATA and routing through vitelity as the SIP trunk
provider (with Astlinux in-between).  I have had complete failure with an
older Linksys/Sipura SPA-2002 and the same SIP trunk. 

I have both a PAP2T and SPA-2002 connected to my system and the audio
quality is noticeably better on the PAP2T.  In particular there is a lot of
background hiss from the SPA-2002 that is not present on the PAP2T.  That
may also suggest that the dynamic range of the SPA-2002 is not as strong as
the PAP2T.  Both the background hiss and a compressed dynamic range would
explain why analog fax does not work well.

In addition to good A to D conversion, which the PAP2T seems to handle well,
you then have to deal with the characteristics of SIP/VoIP.  You may have to
fiddle with settings like jitter buffer and echo cancelling and you want a
high quality trunk provider.


Good luck.

David


On Thu, May 27, 2010 at 8:17 AM, Tom Chadwin
nnpait.servi...@googlemail.com wrote:


Slightly OT...

With an uncustomized 0.7.2 (1.4) on a net5501 with a berofix PRI, what is
the easiest way to attach an analogue fax which currently uses one DDI on
the UK PRI? Will an ATA work?

Thanks

Tom



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pay...@krisk.org.



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Re: [Astlinux-users] Faxing

[David Kerr]

Probably, because you are then less susceptible to the variables of SIP
trunking.  Given you have some PAP2T's I would suggest you just test it.
 Set codec to ulaw or alaw, turn off echo cancel and set jitter buffer to
low.

Good luck.

David

On Thu, May 27, 2010 at 9:35 AM, Tom Chadwin nnpait.servi...@googlemail.com
 wrote:

  As always, I needed to be clearer in my description. Our only trunking is
 ISDN PRI. We are only using SIP/IAX internally. So, would a PAP2T (various
 of which I currently use for voice) work well as the bridge between our
 internal analogue fax and our internal Astlinux box, sending and receiving
 faxes externally via ISDN?

 Thanks

 Tom


  --
 *From:* David Kerr [mailto:da...@kerr.net]
 *Sent:* 27 May 2010 14:28
 *To:* tom.chad...@nnpa.org.uk; AstLinux Users Mailing List
 *Subject:* Re: [Astlinux-users] Faxing

 The answer is it depends.  I have had success with a fax machine
 connected to a linksys PAP2T ATA and routing through vitelity as the SIP
 trunk provider (with Astlinux in-between).  I have had complete failure with
 an older Linksys/Sipura SPA-2002 and the same SIP trunk.

 I have both a PAP2T and SPA-2002 connected to my system and the audio
 quality is noticeably better on the PAP2T.  In particular there is a lot of
 background hiss from the SPA-2002 that is not present on the PAP2T.  That
 may also suggest that the dynamic range of the SPA-2002 is not as strong as
 the PAP2T.  Both the background hiss and a compressed dynamic range would
 explain why analog fax does not work well.

 In addition to good A to D conversion, which the PAP2T seems to handle
 well, you then have to deal with the characteristics of SIP/VoIP.  You may
 have to fiddle with settings like jitter buffer and echo cancelling and you
 want a high quality trunk provider.

 Good luck.

 David


 On Thu, May 27, 2010 at 8:17 AM, Tom Chadwin 
 nnpait.servi...@googlemail.com wrote:

 Slightly OT...

 With an uncustomized 0.7.2 (1.4) on a net5501 with a berofix PRI, what is
 the easiest way to attach an analogue fax which currently uses one DDI on
 the UK PRI? Will an ATA work?

 Thanks

 Tom



 --

 ___
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 Astlinux-users@lists.sourceforge.net
 https://lists.sourceforge.net/lists/listinfo/astlinux-users

 Donations to support AstLinux are graciously accepted via PayPal to
 pay...@krisk.org.




 --


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 https://lists.sourceforge.net/lists/listinfo/astlinux-users

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 pay...@krisk.org.

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Re: [Astlinux-users] Faxing

[Michael Keuter]

Slightly OT...

With an uncustomized 0.7.2 (1.4) on a net5501 with a berofix PRI, what is
the easiest way to attach an analogue fax which currently uses one DDI on
the UK PRI? Will an ATA work?

Thanks

Tom

Hi Tom,

what I've heard, is to best use an ISDN Terminal adapter like the TA33
http://shop.ebay.de/i.html?_nkw=ta33_armrs=1_from=R10_ipg=
connected to an BRI port (second berofix module?) or an AVM Fritzbox 
(can also be tried over SIP) (the old AVM 7050 should be cheap on 
eBay). ATAs like the Linksys PAPT2 do sometimes work and sometimes 
not.

Michael

http://www.mksolutions.info

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Re: [Astlinux-users] Faxing

[Guy Neale]

Hi Tom

Looks like the berofix supports the T.38 fax protocol, it would be worth 
investigating ATA T.38 support, I'm no expert but maybe worth investigating 
more(I know g729 doesn't like to play, and even with the higher bit rate 
codecs, you can have mixed results :-(  )

URL's worth a read
http://shop.a-enterprise.ch/manuals/Berofix-technical-data.pdf
http://www.voip-info.org/wiki/view/Asterisk+fax

Regards Guy

  
On 27/05/2010, at 10:17 PM, Tom Chadwin wrote:

 Slightly OT...
 
 With an uncustomized 0.7.2 (1.4) on a net5501 with a berofix PRI, what is
 the easiest way to attach an analogue fax which currently uses one DDI on
 the UK PRI? Will an ATA work?
 
 Thanks
 
 Tom
 
 
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 Astlinux-users@lists.sourceforge.net
 https://lists.sourceforge.net/lists/listinfo/astlinux-users
 
 Donations to support AstLinux are graciously accepted via PayPal to 
 pay...@krisk.org.
 
 


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Re: [Astlinux-users] Faxing

[Tod Fitch]

If your VoIP provider is setup for T.38 then you may have an issue.  
For in-bound faxes you are in control: If you don't allow T.38 then it  
will stay with whatever codec you have negotiated. Which should be  
g711. For out-bound faxes you are at the mercy of your VoIP provider's  
setup. The receiving (provider's) side of the VoIP connection can  
detect that a fax is being sent and attempt a re-invite using T.38.


The PAP2T does not support T.38.

I switched to using a Grandstream HT502 which claims support for T.38  
but still haven't gotten it to work through my Astlinux box. My  
provider claims better operation if you have the ATA directly register  
with them. The Asterisk logging with debug on claims a rejected codec  
but I don't know if that is Asterisk complaining or if it is my ATA. I  
haven't yet bothered looking at the traffic with Wireshark to figure  
out exactly what is going on.


Net result: If your provider does not do T.38 then you can probably  
get faxes to work using the g711 codec. I have maybe a 95% fax success  
rate with that type of operation. Not good enough for a heavy business  
use but good enough for my needs. If the provider re-invites to T.38  
then you may have a 0% success rate (my experience). I believe that  
the specs call for graceful fall back to the voice codec if the T.38  
invite fails but I haven't seen that happen (two different VoIP  
providers). If anyone knows how to get this to work I would dearly  
like to know.


-Tod



On May 27, 2010, at 6:34 AM, David Kerr wrote:

I should add that the PAP2T I have is one that I got through  
Nextalarm.com which is customized to support alarm/security system  
monitoring over the internet (VoIP). The ATA is customized to  
connect one of the analog lines into their systems, the other line  
is available to configure for my own use (after you get the admin  
password from them).  I mention this because it is possible that the  
customization included work to improve the A to D conversion  
process, not just hard wiring one of the lines to nextalarm's  
systems...

https://nextalarm.com/do/customer/productDetail?id=17

David

On Thu, May 27, 2010 at 9:28 AM, David Kerr da...@kerr.net wrote:
The answer is it depends.  I have had success with a fax machine  
connected to a linksys PAP2T ATA and routing through vitelity as the  
SIP trunk provider (with Astlinux in-between).  I have had complete  
failure with an older Linksys/Sipura SPA-2002 and the same SIP trunk.


I have both a PAP2T and SPA-2002 connected to my system and the  
audio quality is noticeably better on the PAP2T.  In particular  
there is a lot of background hiss from the SPA-2002 that is not  
present on the PAP2T.  That may also suggest that the dynamic range  
of the SPA-2002 is not as strong as the PAP2T.  Both the background  
hiss and a compressed dynamic range would explain why analog fax  
does not work well.


In addition to good A to D conversion, which the PAP2T seems to  
handle well, you then have to deal with the characteristics of SIP/ 
VoIP.  You may have to fiddle with settings like jitter buffer and  
echo cancelling and you want a high quality trunk provider.


Good luck.

David


On Thu, May 27, 2010 at 8:17 AM, Tom Chadwin nnpait.servi...@googlemail.com 
 wrote:

Slightly OT...

With an uncustomized 0.7.2 (1.4) on a net5501 with a berofix PRI,  
what is
the easiest way to attach an analogue fax which currently uses one  
DDI on

the UK PRI? Will an ATA work?

Thanks

Tom



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Donations to support AstLinux are graciously accepted via PayPal to 
pay...@krisk.org.

Re: [Astlinux-users] Faxing

[Tod Fitch]

If you are sending the fax out your PRI line then your PAP2T with  
AstLinux should work just fine, so disregard my earlier response about  
T.38 and VoIP providers. Use the G.711 codec, echo suppression and  
echo canceler off.


-Tod



On May 27, 2010, at 6:35 AM, Tom Chadwin wrote:

As always, I needed to be clearer in my description. Our only  
trunking is ISDN PRI. We are only using SIP/IAX internally. So,  
would a PAP2T (various of which I currently use for voice) work well  
as the bridge between our internal analogue fax and our internal  
Astlinux box, sending and receiving faxes externally via ISDN?


Thanks

Tom


From: David Kerr [mailto:da...@kerr.net]
Sent: 27 May 2010 14:28
To: tom.chad...@nnpa.org.uk; AstLinux Users Mailing List
Subject: Re: [Astlinux-users] Faxing

The answer is it depends.  I have had success with a fax machine  
connected to a linksys PAP2T ATA and routing through vitelity as  
the   SIP trunk provider (with Astlinux in-between).  I have had  
complete failure with an older Linksys/Sipura SPA-2002 and the same  
SIP trunk.


I have both a PAP2T and SPA-2002 connected to my system and the  
audio quality is noticeably better on the PAP2T.  In particular  
there is a lot of background hiss from the SPA-2002 that is not  
present on the PAP2T.  That may also suggest that the dynamic range  
of the SPA-2002 is not as strong as the PAP2T.  Both the background  
hiss and a compressed dynamic range would explain why analog fax  
does not work well.


In addition to good A to D conversion, which the PAP2T seems to  
handle well, you then have to deal with the characteristics of SIP/ 
VoIP.  You may have to fiddle with settings like jitter buffer and  
echo cancelling and you want a high quality trunk provider.


Good luck.

David


On Thu, May 27, 2010 at 8:17 AM, Tom Chadwin nnpait.servi...@googlemail.com 
 wrote:

Slightly OT...

With an uncustomized 0.7.2 (1.4) on a net5501 with a berofix PRI,  
what is
the easiest way to attach an analogue fax which currently uses one  
DDI on

the UK PRI? Will an ATA work?

Thanks

Tom


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.


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Re: [Astlinux-users] Faxing

[Michael Keuter]

Slightly OT...

With an uncustomized 0.7.2 (1.4) on a net5501 with a berofix PRI, what is
the easiest way to attach an analogue fax which currently uses one DDI on
the UK PRI? Will an ATA work?

Thanks

Tom

You could also ask for experiences on the berofix mailing list. It's 
mostly in German, but English is also OK:

berofix-us...@googlegroups.com

Michael

http://www.mksolutions.info

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