IAXmodem

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> 
> Hi,
> 
> I've been using asterisk + iaxmodem + hylafax for a long time quite
> successfully with direct ISDN connections from asterisk to the PSTN.
> 
> Now a new customer insisted on a separate ISDN gateway (Mediatrix
> 3631),
> though I informed them fax could be a problem. My first tests are
> complete failures (carrier not detected); though problems were
> expected,
> I'm surprised to get 0 fax in / out. Just to be clear, here is the
> setup:
> PSTN ---isdn--- Mediatrix ---sip--- Asterisk+iaxmodem+hylafax
> 
> Codec is configured to alaw on the Mediatrix and Asterisk; I've
> verified
> it is actually used. Asterisk and the gateway are on the same switch,
> network seems OK (<1ms ping, no jitter).
> 
> I've made recordings, and I'll be grateful if someone could tell me
> what's wrong, there may be parameters to change on the Mediatrix; they
> are available here: http://www.sysnux.pf/iaxmodem/
> 
> 

Ensure your Mediatrix isn't configured to reinvite to T.38 upon detecting CED/CNG tones. Until recently (Asterisk 1.8.x series) there was little to no proper support for T.38 in Asterisk.

--Tim

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Le 21/08/2011 11:37, Tim Nelson a écrit :
> Ensure your Mediatrix isn't configured to reinvite to T.38 upon detecting CED/CNG tones. Until recently (Asterisk 1.8.x series) there was little to no proper support for T.38 in Asterisk.

Thanks for your reply, I should have mentioned that the Mediatrix is
configured to not use T38.


Thanks,
- -- 
Jean-Denis Girard

SysNux                  Systèmes  Linux  en Polynésie française
http://www.sysnux.pf/   Tél: +689 50 10 40 / GSM: +689 79 75 27
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Jean-Denis Girard wrote:
> Now a new customer insisted on a separate ISDN gateway (Mediatrix 3631),
> though I informed them fax could be a problem. My first tests are
> complete failures (carrier not detected); though problems were expected,
> I'm surprised to get 0 fax in / out. Just to be clear, here is the setup:
>  PSTN ---isdn--- Mediatrix ---sip--- Asterisk+iaxmodem+hylafax
>   

It shouldn't be surprising at all.  See:

http://hylafax.sourceforge.net/docs/fax-over-voip.pdf

> Codec is configured to alaw on the Mediatrix and Asterisk; I've verified
> it is actually used. Asterisk and the gateway are on the same switch,
> network seems OK (<1ms ping, no jitter).
>   

What, exactly, are you doing to assure yourself that there is no jitter?

> I've made recordings, and I'll be grateful if someone could tell me
> what's wrong, there may be parameters to change on the Mediatrix; they
> are available here: http://www.sysnux.pf/iaxmodem/
>   

Listen to the audio yourself.  You can *hear* the jitter it's so bad.

Thanks,

Lee.

-----Original Message-----
From: Jean-Denis Girard <jd.girard@...>
To: iaxmodem-users@...
Date: Sun, 21 Aug 2011 11:19:58 -1000
Subject: [iaxmodem-users] ISDN gateway

> I've been using asterisk + iaxmodem + hylafax for a long time quite
> successfully with direct ISDN connections from asterisk to the PSTN.
.....
> I'm surprised to get 0 fax in / out. Just to be clear, here is the
> setup:
>  PSTN ---isdn--- Mediatrix ---sip--- Asterisk+iaxmodem+hylafax


Hi,
maybe IAXmodem is not the best solution in this case.
Have you tried T38Modem ? (http://sourceforge.net/projects/t38modem/)

I have no experience with Mediatrix gateways, but with Patton boxes works
great.

--PSTN-->[PATTON GW]--t.38-->[Asterisk(Sip t.38
passthrough)]--t.38-->[T38Modem]-->[Hylafax]

Regards,
Massimo

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Le 21/08/2011 19:33, Lee Howard a écrit :
> What, exactly, are you doing to assure yourself that there is no jitter?

Nothing, I just checked ping times, which seemed regular.

> 
>> I've made recordings, and I'll be grateful if someone could tell me
>> what's wrong, there may be parameters to change on the Mediatrix; they
>> are available here: http://www.sysnux.pf/iaxmodem/
>>   
> 
> Listen to the audio yourself.  You can *hear* the jitter it's so bad.

I did listen to the audio, but I couldn't figure out what the problem was.


Thanks,
- -- 
Jean-Denis Girard

SysNux                  Systèmes  Linux  en Polynésie française
http://www.sysnux.pf/   Tél: +689 50 10 40 / GSM: +689 79 75 27
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Jean-Denis Girard wrote:
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> Le 21/08/2011 19:33, Lee Howard a écrit :
>   
>> What, exactly, are you doing to assure yourself that there is no jitter?
>>     
>
> Nothing, I just checked ping times, which seemed regular.

Jitter largely has to do with UDP packet loss, and I don't know that you 
can test for UDP packet loss with an ICMP ping.

In the case of your jitter - it sounds like there is a clock slipping or 
gradual clock shifting between the two devices because the jitter is 
extremely regular.  So I suspect that it's not UDP packet loss, but 
rather a configuration issue with respect to clocking between the two 
devices.

Thanks,

Lee.

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Hi Massimo,

Le 21/08/2011 20:46, Massimo De Nadal a écrit :
> maybe IAXmodem is not the best solution in this case.
> Have you tried T38Modem ? (http://sourceforge.net/projects/t38modem/)
> 
> I have no experience with Mediatrix gateways, but with Patton boxes works
> great.
> 
> --PSTN-->[PATTON GW]--t.38-->[Asterisk(Sip t.38
> passthrough)]--t.38-->[T38Modem]-->[Hylafax]

That's a good idea. My plan B was to use the T38 gateway patch for
Asterisk and keep iaxmodem:
 PSTN --isdn-- Mediatrix --t38-- Asterisk+t38gateway+iaxmodem+hylafax

Do you have experience with that patch? I wonder which of the two
solutions would be more reliable.


Thanks,
- -- 
Jean-Denis Girard

SysNux                  Systèmes  Linux  en Polynésie française
http://www.sysnux.pf/   Tél: +689 50 10 40 / GSM: +689 79 75 27
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-----Original Message-----
From: Jean-Denis Girard <jd.girard@...>
To: iaxmodem-users@...
Date: Mon, 22 Aug 2011 06:14:34 -1000
Subject: Re: [iaxmodem-users] ISDN gateway

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> 
> Hi Massimo,
...
> 
> That's a good idea. My plan B was to use the T38 gateway patch for
> Asterisk and keep iaxmodem:
>  PSTN --isdn-- Mediatrix --t38-- Asterisk+t38gateway+iaxmodem+hylafax
> 
> Do you have experience with that patch? 

Yes, this setup is in production to a customer of mine and it works
flawlessly.
This is the flow:

PRI-PSTN-->CISCO Router controlled by CCM-->SIP T.38 Trunk-->Aterisk 1.6.2
T.38GW patched-->IAXmodem-->Hylafax

The problem with this kind of setup is the overhead around the T.38
conversions.
A first softmodem is run by the gateway (the Mediatrix in your case).
A second is run by the Asterisk T.38 gateway (one instance of Spandsp)
A third is run by iaxmodem (another instance of Spandsp (the IAXmodem
embedded)).

Well, IMHO if you connect the PSTN with a card (Dahdi, mISDN etc.)
IAXmodem is by far the best solution, if you connect the PSTN via SIP
(T.38 supported ATA, T.38 supported SIP provider etc.) try out T38Modem,
Without T.38 I've never reached a really satisfactory fax reliability over
IP networks (even lan).
Just my 2 cents :-)

Regards, 
Massimo

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Le 22/08/2011 06:47, Massimo De Nadal a écrit :
> Yes, this setup is in production to a customer of mine and it works
> flawlessly.
> This is the flow:
> 
> PRI-PSTN-->CISCO Router controlled by CCM-->SIP T.38 Trunk-->Aterisk 1.6.2
> T.38GW patched-->IAXmodem-->Hylafax
> 
> The problem with this kind of setup is the overhead around the T.38
> conversions.
> A first softmodem is run by the gateway (the Mediatrix in your case).
> A second is run by the Asterisk T.38 gateway (one instance of Spandsp)
> A third is run by iaxmodem (another instance of Spandsp (the IAXmodem
> embedded)).
> 
> Well, IMHO if you connect the PSTN with a card (Dahdi, mISDN etc.)
> IAXmodem is by far the best solution, if you connect the PSTN via SIP
> (T.38 supported ATA, T.38 supported SIP provider etc.) try out T38Modem,
> Without T.38 I've never reached a really satisfactory fax reliability over
> IP networks (even lan).
> Just my 2 cents :-)

Thanks a lot for sharing your experience, I'll try t38modem.


Thanks,
- -- 
Jean-Denis Girard

SysNux                  Systèmes  Linux  en Polynésie française
http://www.sysnux.pf/   Tél: +689 50 10 40 / GSM: +689 79 75 27
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Am 22.08.2011 18:14, schrieb Jean-Denis Girard:
> Hi Massimo,
> 
> Le 21/08/2011 20:46, Massimo De Nadal a écrit :
>> maybe IAXmodem is not the best solution in this case.
>> Have you tried T38Modem ? (http://sourceforge.net/projects/t38modem/)
> 
>> I have no experience with Mediatrix gateways, but with Patton boxes works
>> great.
> 
>> --PSTN-->[PATTON GW]--t.38-->[Asterisk(Sip t.38
>> passthrough)]--t.38-->[T38Modem]-->[Hylafax]
> 
> That's a good idea. My plan B was to use the T38 gateway patch for
> Asterisk and keep iaxmodem:
>  PSTN --isdn-- Mediatrix --t38-- Asterisk+t38gateway+iaxmodem+hylafax
> 
> Do you have experience with that patch? I wonder which of the two
> solutions would be more reliable.

I never succeeded to have a working T38modem, thus I always use
iaxmodem. Either I use G711 (works fine for me over LAN) or Asterisk
1.6.? with the t38-gateway patch.

regards
Klaus

PS: Make sure that all LAN connections are full-duplex. Half-duplex or
autosensing problems are quiet often problems of jitter/loss in LAN.

On Tue, Aug 23, 2011 at 09:48:50AM +0200, Klaus Darilion wrote:
> 
> 
> Am 22.08.2011 18:14, schrieb Jean-Denis Girard:
> > Hi Massimo,
> > 
> > Le 21/08/2011 20:46, Massimo De Nadal a écrit :
> >> maybe IAXmodem is not the best solution in this case.
> >> Have you tried T38Modem ? (http://sourceforge.net/projects/t38modem/)
> > 
> >> I have no experience with Mediatrix gateways, but with Patton boxes works
> >> great.
> > 
> >> --PSTN-->[PATTON GW]--t.38-->[Asterisk(Sip t.38
> >> passthrough)]--t.38-->[T38Modem]-->[Hylafax]
> > 
> > That's a good idea. My plan B was to use the T38 gateway patch for
> > Asterisk and keep iaxmodem:
> >  PSTN --isdn-- Mediatrix --t38-- Asterisk+t38gateway+iaxmodem+hylafax
> > 
> > Do you have experience with that patch? I wonder which of the two
> > solutions would be more reliable.
> 
> I never succeeded to have a working T38modem, thus I always use
> iaxmodem. Either I use G711 (works fine for me over LAN) or Asterisk
> 1.6.? with the t38-gateway patch.


I never succeeded to have a working Asterisk install with T.38,
neither T.38 passthrought anyhow I have lot of T38Modem installs
running smoothly :)

Best Regards

Am 23.08.2011 11:59, schrieb Raúl Alexis Betancor Santana:
> On Tue, Aug 23, 2011 at 09:48:50AM +0200, Klaus Darilion wrote:
>>
>>
>> Am 22.08.2011 18:14, schrieb Jean-Denis Girard:
>>> Hi Massimo,
>>>
>>> Le 21/08/2011 20:46, Massimo De Nadal a écrit :
>>>> maybe IAXmodem is not the best solution in this case.
>>>> Have you tried T38Modem ? (http://sourceforge.net/projects/t38modem/)
>>>
>>>> I have no experience with Mediatrix gateways, but with Patton boxes works
>>>> great.
>>>
>>>> --PSTN-->[PATTON GW]--t.38-->[Asterisk(Sip t.38
>>>> passthrough)]--t.38-->[T38Modem]-->[Hylafax]
>>>
>>> That's a good idea. My plan B was to use the T38 gateway patch for
>>> Asterisk and keep iaxmodem:
>>>  PSTN --isdn-- Mediatrix --t38-- Asterisk+t38gateway+iaxmodem+hylafax
>>>
>>> Do you have experience with that patch? I wonder which of the two
>>> solutions would be more reliable.
>>
>> I never succeeded to have a working T38modem, thus I always use
>> iaxmodem. Either I use G711 (works fine for me over LAN) or Asterisk
>> 1.6.? with the t38-gateway patch.
> 
> 
> I never succeeded to have a working Asterisk install with T.38,
> neither T.38 passthrought anyhow I have lot of T38Modem installs
> running smoothly :)

Do you have a HOWTO (or is there somewhere a good one) to install
t38modem (proper versions, proper pwlib versions ....)?

Thanks
Klaus

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Le 23/08/2011 22:35, Klaus Darilion a écrit :
> Do you have a HOWTO (or is there somewhere a good one) to install
> t38modem (proper versions, proper pwlib versions ....)?

I successfully installed t38modem (though it does not currently work),
by downloading everything from sourceforge:
http://sourceforge.net/projects/t38modem/files/t38modem/2.0.0/

opal-24174.tgz contains both ptlib and opal.

I built ptlib like this:
./configure --enable-stun --prefix=/opt/ptlib/
make && make install

Then I applied the patch to opal and built it:
patch -p0 < ../opal-24174-sippdu.cxx.patch
PKG_CONFIG_PATH=/opt/ptlib/lib/pkgconfig/ ./configure --prefix=/opt/opal
make && make install

Then t38modem (PTLIBDIR and OPALDIR must point to ptlib and opal sources):
PTLIBDIR=/home/sysnux/RPM/BUILD/ptlib
OPALDIR=/home/sysnux/RPM/BUILD/opal/ make USE_OPAL=1 USE_UNIX98_PTY=1
Then simply copy the executable to /opt/t38modem.

I used this procedure on Centos 64bits and Mandriva 32 bits without
build problem.

t38modem seems to work fine, but I have not able to send / receive a
fax. I tried with the Mediatrix and then simply as loopback test without
success.


Best regards,
- -- 
Jean-Denis Girard

SysNux                  Systèmes  Linux  en Polynésie française
http://www.sysnux.pf/   Tél: +689 50 10 40 / GSM: +689 79 75 27
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On Wed, Aug 24, 2011 at 10:35:36AM +0200, Klaus Darilion wrote:

> Do you have a HOWTO (or is there somewhere a good one) to install
> t38modem (proper versions, proper pwlib versions ....)?

http://www.foriamroot.org/hylafax-6-0-debian-or-ubuntu-t38modem-1-0-asterisk-1-6/

And take a look at my next message on this list.

Best regards

On Wed, Aug 24, 2011 at 06:04:38AM -1000, Jean-Denis Girard wrote:
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> 
> Le 23/08/2011 22:35, Klaus Darilion a écrit :
> > Do you have a HOWTO (or is there somewhere a good one) to install
> > t38modem (proper versions, proper pwlib versions ....)?
> 
> I successfully installed t38modem (though it does not currently work),
> by downloading everything from sourceforge:
> http://sourceforge.net/projects/t38modem/files/t38modem/2.0.0/
> 
> opal-24174.tgz contains both ptlib and opal.
> 
> I built ptlib like this:
> ./configure --enable-stun --prefix=/opt/ptlib/
> make && make install
> 
> Then I applied the patch to opal and built it:
> patch -p0 < ../opal-24174-sippdu.cxx.patch
> PKG_CONFIG_PATH=/opt/ptlib/lib/pkgconfig/ ./configure --prefix=/opt/opal
> make && make install
> 
> Then t38modem (PTLIBDIR and OPALDIR must point to ptlib and opal sources):
> PTLIBDIR=/home/sysnux/RPM/BUILD/ptlib
> OPALDIR=/home/sysnux/RPM/BUILD/opal/ make USE_OPAL=1 USE_UNIX98_PTY=1
> Then simply copy the executable to /opt/t38modem.
> 
> I used this procedure on Centos 64bits and Mandriva 32 bits without
> build problem.
> 
> t38modem seems to work fine, but I have not able to send / receive a
> fax. I tried with the Mediatrix and then simply as loopback test without
> success.


You will need to apply this patch to OPAL
, then recompile and all will work smoothly, I haves 100%
sucessfull rate with:

T38Modem  <-> GS 502/503
T38Modem  <-> Mediatrix GW's, both, RDSI and Analog ones

Buttttttttttttt ... if you put and Asterisk doing T38 Passthrought it
will NEVER,NEVER,EVER work, tested with Asterisk 1.2.X, 1.4.X, 1.6.X
... and then I leave Asterisk for the rest of the times.

Best regards

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Le 24/08/2011 09:28, Raúl Alexis Betancor Santana a écrit :
> You will need to apply this patch to OPAL
> , then recompile and all will work smoothly, I haves 100%
> sucessfull rate with:
> 
> T38Modem  <-> GS 502/503
> T38Modem  <-> Mediatrix GW's, both, RDSI and Analog ones

Thanks Raul, I didn't have time to test your patch, but I will and
report here.

> Buttttttttttttt ... if you put and Asterisk doing T38 Passthrought it
> will NEVER,NEVER,EVER work, tested with Asterisk 1.2.X, 1.4.X, 1.6.X
> ... and then I leave Asterisk for the rest of the times.

That's annoying. I would prefer to keep all calls flow through Asterisk,
for billing purposes for example. It seems that Massimo was successful
with this setup, as well as the link you provided (foriamroot.org).


Best regards,
- -- 
Jean-Denis Girard

SysNux                  Systèmes  Linux  en Polynésie française
http://www.sysnux.pf/   Tél: +689 50 10 40 / GSM: +689 79 75 27
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-----Original Message-----
From: Jean-Denis Girard <jd.girard@...>
To: iaxmodem-users@...
Date: Thu, 25 Aug 2011 06:46:39 -1000
Subject: Re: [iaxmodem-users] ISDN gateway

> That's annoying. I would prefer to keep all calls flow through
> Asterisk,
> for billing purposes for example. It seems that Massimo was successful
> with this setup, as well as the link you provided (foriamroot.org).


Yes, it works for me, but I've discovered t38modem only recently, so all
my tests are only asterisk 1.8 based.
During the weekend I'll post my setups.

Massimo

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Hi Massimo,

Le 26/08/2011 04:07, Massimo De Nadal a écrit :
> Yes, it works for me, but I've discovered t38modem only recently, so all
> my tests are only asterisk 1.8 based.

I'm using asterisk 1.8.5 myself.

> During the weekend I'll post my setups.

That would be great. Also could you please post the version of t38modem
you are using? I have:

[jdg@... ~]$ /opt/t38modem/t38modem -v
T38Modem Version 2.0.0
 (OPAL-3.9.0/3.9beta0, PTLIB-2.9.0/2.9beta0 (svn:24165)) by Vyacheslav
Frolov on Unix Linux (3.0.3-desktop586-1.mga2-i686)

2011/08/26 06:05:08.019                T38Modem         Version 2.0.0 by
Vyacheslav Frolov on Unix Linux (3.0.3-desktop586-1.mga2-i686) with
PTLib (v2.9beta0 (svn:24165)) at 2011/8/26 6:05:08.019


Thanks,
- -- 
Jean-Denis Girard

SysNux                  Systèmes  Linux  en Polynésie française
http://www.sysnux.pf/   Tél: +689 50 10 40 / GSM: +689 79 75 27
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Hi list,

Just to follow-up on that thread, I've not been able to use t38modem,
though I spent many hours on it. Also it didn't even compile on Fedora
16. So I gave up, and went back to my initial plan B, which was to use
the T38gateway patch for asterisk
(https://issues.asterisk.org/jira/browse/13405)

It seems to work fine, tested with two different setups:
Hylafax <--> Iaxmodem <--> Asterisk ---SIP/T38--- HT503 <--> Fax machine
Hylafax <--> Iaxmodem <--> Asterisk ---SIP/T38--- Mediatrix <->PSTN ISDN


Thanks,
- -- 
Jean-Denis Girard

SysNux                  Systèmes  Linux  en Polynésie française
http://www.sysnux.pf/   Tél: +689 50 10 40 / GSM: +689 79 75 27
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