[Asterisk-Users] RxFAX generates no tiff file

[Steve Underwood]

Hi Darren,

There is no guarantee your problem is frame slips. However, a number of 
people have reported problems with rxfax going wrong in the middle of a 
page. A number have reported other fax hardware doing the same thing. 
Every one I have investigated so far has been the same problem - frame 
slips. It is a puzzle to me how these had previously gone unnoticed, 
since they usually produce an annoying tick each time a slip occurs. 
However, it seems a lot of people are operating their trunks like that. 
How to fix them? This is left as an exercise for the reader...... 
Seriously, there are too many differences between people's setups for me 
to really say. If you have a channel bank, * should be the clock master 
for that channel bank. Try checking that it is.

Regards,
Steve


Darren Nickerson wrote:

>Steve,
>
>The IRQ miss counter is only 45, and we've sent thousands of faxes since the
>last boot. I'd like to understand the IRQ miss problem and do what we can to
>remedy it, but I think that may be separate and distinct from our faxing
>problems.
>
>Faxes fail without the IRQ miss counter incrementing.
>
>Anyway, the question I was really looking for you to tackle was 'how do I
>detect the frame slips you say we all have' ;-)
>
>-d
>
>--
>Darren Nickerson
>Senior Sales & Support Engineer
>iFax Solutions, Inc. www.ifax.com
>darren.nickerson at ifax.com
>+1.215.438.4638
>+1.215.243.8335 (fax)
>
>----- Original Message ----- 
>From: "Steve Underwood" <steveu at coppice.org>
>To: <asterisk-users at lists.digium.com>
>Sent: Monday, May 24, 2004 8:34 AM
>Subject: Re: [Asterisk-Users] RxFAX generates no tiff file
>
>
>  
>
>>Hi Darren
>>
>>If you are seeing IRQ misses there must be data misses too. :-)
>>
>>Regards,
>>Steve
>>
>>
>>Darren Nickerson wrote:
>>
>>    
>>
>>>Steve,
>>>
>>>We have no frame slips, so we probably have a frame slip problem ;-)
>>>
>>>This may be plaguing us on our faxing. Gain and echo cancelation (ie:
>>>      
>>>
>none)
>  
>
>>>are all approximately correct, and yet still we cannot get reliable
>>>      
>>>
>faxing
>  
>
>>>through the POTS lines plugged into our FXO card on the Adit (whereas we
>>>      
>>>
>can
>  
>
>>>fax well when using the POTS lines directly). Faxing T1 -> T1 via a
>>>      
>>>
>TE405P
>  
>
>>>works well, ... it's only when we try to use the connection to the Adit
>>>      
>>>
>(24
>  
>
>>>fxs_ks channels in a T1) that things go horribly wrong.
>>>
>>>Is there any sure-fire way to detect frame slips? I see a counter for IRQ
>>>misses with zttool, but that's all. In my Adit600 I see lots of measures
>>>      
>>>
>of
>  
>
>>>errors (line errored seconds, controlled slip seconds, bursty errored
>>>seconds etc) but they're all zero.
>>>
>>>Am I missing an obvious way to detect./observe these events?
>>>
>>>-Darren
>>>
>>>--
>>>Darren Nickerson
>>>Senior Sales & Support Engineer
>>>iFax Solutions, Inc. www.ifax.com
>>>darren.nickerson at ifax.com
>>>+1.215.438.4638
>>>+1.215.243.8335 (fax)
>>>
>>>----- Original Message ----- 
>>>From: "Steve Underwood" <steveu at coppice.org>
>>>To: <asterisk-users at lists.digium.com>
>>>Sent: Sunday, May 23, 2004 8:03 PM
>>>Subject: Re: [Asterisk-Users] RxFAX generates no tiff file
>>>
>>>
>>>
>>>
>>>      
>>>
>>>>Hi Petr,
>>>>
>>>>For most people who are sure they have no frame slips, the problem
>>>>usually turns out to be frame slips :-)
>>>>
>>>>If you are *really* sure you do not have frame slips, then uncomment the
>>>>first line in t30.c, and rebuild and reinstall spandsp. The when you
>>>>exchange a fax you should end up with a pair of audio files in your /tmp
>>>>directory - one for the transmit signal and one for the receive signal.
>>>>Send those to me, and I will investigate.
>>>>
>>>>Regards,
>>>>Steve
>>>>
>>>>
>>>>Petr Grussmann wrote:
>>>>
>>>>
>>>>
>>>>        
>>>>
>>>>>I have same problem connected to PBX over E1 and sync and not slip I
>>>>>have latest version spanDSP
>>>>>
>>>>>I receiving 1/3 pages from faxis
>>>>>
>>>>>?
>>>>>who is a problems-)
>>>>>
>>>>>
>>>>>I
>>>>>Steve Underwood wrote:
>>>>>
>>>>>
>>>>>
>>>>>          
>>>>>
>>>>>>Hi Troy,
>>>>>>
>>>>>>People had a lot of problems like this with earlier versions of
>>>>>>spandsp. However, the latest version is pretty solid, and people are
>>>>>>using it in high volume production applications. If you are getting
>>>>>>these bad results with the latest version I would be interested to
>>>>>>see the audio log file, so I can investigate the reason.
>>>>>>
>>>>>>Regards,
>>>>>>Steve
>>>>>>
>>>>>>
>>>>>>Troy Settle wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>            
>>>>>>
>>>>>>>Dunno about not being able to generate a tiff, I got rxfax to do
>>>>>>>that, but
>>>>>>>they're badly malformed.
>>>>>>>
>>>>>>>http://roanoke-voip01.psknet.com/fax/
>>>>>>>
>>>>>>>
>>>>>>>              
>>>>>>>