asterisk users - Jan 2006 - Fax, txfax -bizarre thing

Hi,

I've been struggling with this for a quite long time. Maybe I am not the
first asterisk user with this problem, (I try to search on google, but I
didn't find anything good). My point is:
I try to set up * to work as a fax server. Each incoming fax (from PSTN)
should be received on email. Luckily it works. I didn't notice any problem
with receiving faxes on email, so rxfax works OK. But when I try send and
email which is converted to fax tiff image I got nothing but troubles. I'm
able to send a fax, the remote end answers and I'm receiving the fax but
suddenly "something" bizarre is happening. The fax is dropping the
connection and I get only half (sometimes even less than a half) of the
page. Sometimes I'm receiving whole page. 50% of the fax transmissions is
OK.  I am sure that this is not cause by the conversion to tiff image I
check it and I'm sure of it. To me it looks like the txfax application cause
some problems.
Can anyone tell me, if the txfax, rxfax and spandsp are reliable (which
version)?
I also heard, that I should use a Digium cards in Asterisk server to have
fax transmission work properly, is that the truth? Why?
Could anyane tell what is the best solution for Asterisk and fax
transmission (which version of Asterisk and spandsp, which cards ..) or
maybe I have to switch to hylafax?

My environment looks like this:

Asterisk1.0.9 with spandsp-0.0.2pre21 and bristuff-0.2.0-RC8p with ISDN
HFC-S cards ---> PSTN (ISDN) ---> remote fax

I also try this with:

Asterisk1.0.9 with spandsp-0.0.2pre21 and bristuff-0.2.0-RC8p with ISDN
HFC-S cards ---> PSTN (ISDN) ---> Another Asterisk ---> remote fax

but with the same result.

Thanks in advance for any hints.
Cheers

Andrew Nowrot
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Hi,

I having similar problem. Unfortunately each thread is archive leads to nowhere.
I read a post in which similar problem was solved by changing rxgain and txgain
to 15. Maybe this would help.
Does anyone have common problems?

I was wondering why asterisk - great telecommunication program - has such a weak
fax support. I am talking about mail to fax and fax to mail. Or maybe I am the
only one who has the problems with it.

If someone has some experience please help.

Best wishes

Andrutto 


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Hi,

I have a problem with pattern matching N what should digit 2 to 9
in Asterisk 1.2.1.

If I dial 220 I did not get an PlayBack of invalid. Asterisk jumps into the 
context dialout and find there an matching _2. and is using this. 

If I change _NNN to _XXX everything works fine. If I dial 220 I hear playtones 
invalid. It seemed to be that pattern matching with N is not working as 
designed.



Any ideas?

best regards
Thomas



extensions.conf
---------------------
[internal]
#include "/etc/asterisk/x_internal.conf"


x_internal.conf
-----------------

	exten => 210,1,Macro(internalsqldial_stand,${EXTEN})

	exten => _NNN,1,NoOp(wrong number dialed)
	exten => _NNN,n,PlayBack(invalid)
	exten => _NNN,n,Hangup()

	include => dialout

> I having similar problem. Unfortunately each thread is archive leads to
nowhere. I
read a post in which similar problem was solved by changing rxgain and txgain to
15.
Maybe this would help.
> Does anyone have common problems?
> 
> I was wondering why asterisk - great telecommunication program - has such a
weak fax
support. I am talking about mail to fax and fax to mail. Or maybe I am the only
one who
has the problems with it.
> 
> If someone has some experience please help.
In addition to what others have already mentioned, fax support requires
excellent * timing & bus characteristics, and the digium tdm card does not
provide
that (nor does the older x100p). Those that have spandsp running are primarily
T1/E1 users.

Running fax over sip channels (and networks) also requires rather tight
requirements in terms of latency, jitter, etc, that has been discussed
many times on this list.

> Of course that's not a problem to use hylafax, but I just want to have
it
on one machine (I'm afraid that Asterisk and hylafax > won't run on
the same
machine :( )

[Colin Anderson] I am experimenting with IAXmodem to Hylafax running on an
Asterisk server. It works. Last Thur, I had 98 virtual modems recognized and
running under Hylafax. So far, I can send and recieve faxes reasonably well
but there's some configuration issues I have to get out of the way before I
would beta it on my users. I expect that Hylafax to a couple of plain old
USR modems running on /ttys0 and /ttys1 would work fine enough even if
Asterisk was on the box. Even though the postscript conversion is done on
the server that can be controlled with -nice. After that all that Hylafax
has to do is service the modems and the clients. This seems to be pretty low
overhead - I think the client protocol is FTP on a nonstandard port, and
servicing a couple of modems at 9600 can't be too taxing. Hell, 25 modems
shouldn't be taxing, on a modern machine.
 
BTW I have used, installed, admin'd etc about a dozen big Windows faxing
solutions (basically all of the big players) and I've never used Hylafax
before, and I was really impressed. It's better than 80% of the Windows
product offerings, IMO. 

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Hello All,

Dunno what happen but Asterisk is refusing to start... Went over the  
log and found out that "app_rxfax.so" is failing to load.

Jan  7 11:57:28 VERBOSE[4320] logger.c:  [app_rxfax.so]Jan  7  
11:57:28 WARNING[4320] loader.c: /usr/lib/asterisk/modules/ 
app_rxfax.so: undefined symbol: fax_set_phase_d_handler
Jan  7 11:57:28 WARNING[4320] loader.c: Loading module app_rxfax.so  
failed!

Is there any way to bypass this module and start Asterisk...

I think it was a bad idea to compile Asterisk with fax capability...

Thanks,
Neal

Yes, you could do that making some changes on modules.conf

noload => app_rxfax.so

Regards

Alberto

Nitesh Divecha wrote:
> Hello All,
>
> Dunno what happen but Asterisk is refusing to start... Went over the  
> log and found out that "app_rxfax.so" is failing to load.
>
> Jan  7 11:57:28 VERBOSE[4320] logger.c:  [app_rxfax.so]Jan  7  
> 11:57:28 WARNING[4320] loader.c: /usr/lib/asterisk/modules/ 
> app_rxfax.so: undefined symbol: fax_set_phase_d_handler
> Jan  7 11:57:28 WARNING[4320] loader.c: Loading module app_rxfax.so  
> failed!
>
> Is there any way to bypass this module and start Asterisk...
>
> I think it was a bad idea to compile Asterisk with fax capability...
>
> Thanks,
> Neal
>
>
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Hi,

andrutto wrote:
>>I was wondering why asterisk - great telecommunication program - has
such a weak fax support.
>>
>Because it's a PBX and not a fax server.
Yeah, but to traditional PBX central you can plug fax machine hassle free.

I don%u2019t want to use such a big thing like fax server (another machine and
another cost ....). I just want to connect to Asterisk one or two fax devices
like a normal phone and use them in traditional way I would say paper way. Is
this going to work with Asterisk. Or fax plus Asterisk is just something that
will not work.

Best regards

Andrutto

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