[Asterisk-Users] RxFAX generates no tiff file

[Darren Nickerson]

Steve,

Thanks, that's helpful. Please let me be clear, I'm not asking for a way to
fix them, but rather a way to see if slips are happening in the first place.
The annoying tick is helpful information ... we can listen for that. I was
hoping a more diagnostic way might exist. I guess not! ;-)

-d

----- Original Message ----- 
From: "Steve Underwood" <steveu at coppice.org>
To: <asterisk-users at lists.digium.com>
Sent: Monday, May 24, 2004 9:55 AM
Subject: Re: [Asterisk-Users] RxFAX generates no tiff file


> 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/
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
>
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