[asterisk-users] Faxing: Anyone have a compiled executable?

[William Stillwell (Lists)]

This is what I was using at the time:

asterisk-1.4.21.2
libpri-1.4.6
wanpipe-3.2.7
zaptel-1.4.11
spandsp 0.0.4pre16
unknown rx_fax version.


As I can see there is a 0.0.6pre16 version now..

At the time, I used this tutorial I found on the net to setup rxfax/spandsp:
http://www.asteriskguru.com/tutorials/spandsp.html

Which in its self, is extremely old.

I was using PSTN.

I cut the error rate tremendously when I rebuild the box as there was a
pci-express timing issue (I had a 50% fail rate before that), as the PSTN
hardware provided determine from examining server logs. But some callers
just could not send a fax, it would fail every time, and I just couldn't
reproduce it.. 

I look forward to retrying out spandsp on my next build or server upgrade.

Thank you Steve for responding to my post, and all the work you put into
SpanDSP & the Asterisk Community.

William Stillwell




-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Steve
Underwood
Sent: Thursday, January 07, 2010 8:55 PM
To: asterisk-users at lists.digium.com
Subject: Re: [asterisk-users] Faxing: Anyone have a compiled executable?

On 01/08/2010 06:05 AM, William Stillwell (Lists) wrote:
> Has there been any improvement with app_fax ?
>
> I stopped using it as I had a high failure rate with inbound faxes (10%+)
> 1000 faxes a week ,with over a 100 failures can get quite annoying from
> people complaining.. I could get it to fail everytime I tried sending a
> solid black fax page.
>
> (ie, take a sheet of paper that is all black, or heavily black, and fax
it,
> I got a ton of errors, or just plain rx reception failure)..
>    
If you want an idea of the performance level to expect from app_fax see 
http://www.soft-switch.org/spandsp-soft-fax-performance.html

If 10% of your FAXes are failing, and they really have the potential to 
succeed (i.e. not voice calls, wrong numbers, etc), that's awful. 
Anything above 1% is poor. app_fax on a well set up system, with no 
timing issues, achieves >99% success for PSTN calls. Results with calls 
on the internet will vary, depending on the quality of your VoIP links. 
T.38 calls are generally far more reliable than audio ones across the 
internet. Are you using PSTN or VoIP connexions?

Sending a black page is no harder than sending a white one. If you want 
a real stress test, try the checkerboard pattern TIFF file page, amongst 
the spandsp test data. That takes about half an hour to send one page. 
On a well set up system you should be able to send or receive those 
pages all day. If you can't, you probably have timing issues in your 
Asterisk setup.

If you are going to ask if something has improved, its rather important 
to say which versions you are running now, and how you use them.

Steve


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