[Asterisk-Users] RxFax - tiff problem

[Vladyslav]

Have your even had success sending couple pages at once without loosing
a part of the page?
Had the same problem with X100P and it's still unsolved.

Just wondering how I could synchronize timing with PSTN on the FXO card.


On Thu, 2004-10-07 at 19:41, Snezhana Bekova wrote:
> Hi!
> 
> I have another question regarding this issue:
> 
> If I send multiple pages I do not loose all the remaining pages after a frame
> slip has occured, but only the rest of the current page. It seems to me as if
> the frame slip looses some relatively small portion of the image, but not the
> whole image from this point on to the end of the page. I can receive the next
> page on the same connection, but I do not receive a portion of the previous
> page say from where the connection is fine again.
> 
> Why is this? Isn't it possible to loose some part of a page because of frame
> slips and still receive the rest of the same page?
> I am placing a multi-page fax (each page is OK in the beginning) under the
> following URL:
> http://sbekova.cyberbg.com/fax/fax-028477011_1.tif
> 
> Snezhana Bekova
> 
> 
> Цитат на писмо от Steve Underwood <steveu at coppice.org>:
> 
> > Hi,
> >
> > If the problem on the PSTN cside, you need to ensure your E1/T1 is
> > synchronsied to the PSTN. They will not synchronise to you. Look in your
> > zaptel.conf, and ensure it is set to treat your E1/T1 as the primary
> > clock source.
> >
> > Regards,
> > Steve
> >
> >
> > Snezhana Bekova wrote:
> >
> > > Hi Steve,
> > > thanks very much for your answer!
> > >
> > > It is unclear to me if this is a clock problem or a network problem?
> > > (the traffic comes from some Cisco VoIP equipment at our operator's
> > > side and passes a few 100Mbit switches on fiber).
> > >
> > > If it is a clock problem, what is to be done? Do we need to syncronise
> > > the clock of the asterisk machine at our side to its hardware clock in
> > > some way (how?) or is the problem at the operator's side?
> > >
> > > Snezhana Bekova
> > >
> > >
> > > Цитат на писмо от Steve Underwood <steveu at coppice.org>:
> > >
> > > > Hi Snezhana,
> > > >
> > > > Looking at the audio file, there are frame slips. That is, a clock
> > > > synchronisation problem, or a machine missing interrupts has caused one
> > > > or more audio samples to be lost. Fast modems (anything faster than
> > > > 1200bps basically) cannot cope with even a single lost sample.
> > > >
> > > > See http://ww.opencall.org/faq/x26.html and
> > > > http://ww.opencall.org/faq/x29.html
> > > >
> > > > Regards,
> > > > Steve
> > > >
> > > >
> > > > Snezhana Bekova wrote:
> > > >
> > > > > Hello,
> > > > > We use tiff version 3.5.7-2 and spandsp-0.0.2pre3 with asterisk
> > > > > version 1.0 on debian unstable. I have posted for our problem wtih
> > > > > fax. RxFax works and we receive faxes, but the tiff file is sometimes
> > > > > malformed although the fax seems to be received correctly. Our
> > > > > asterisk server receives calls and faxes from a mobile operator. We
> > > > > are connected to their Cisco router which connects to our asterisk
> > > > > over VoIP that goes inside a Vlan over 100Mbit fiber which passes a
> > > > > few switches. We move asterisk to other server, so it is powerful
> > > > > enough - it is under load of about 0.01 and CPU load 1% - 2%. So the
> > > > > problem is not the server.
> > > > > Maybe the problem is on the VoIP channel, but we cannot prove it.
> > > > > You can see at http://sbekova.cyberbg.com/fax/ a new example of a
> > > > > received tiff file, some audio log files and debug log.
> > > > > Are the switches and/or routers changing the packet order or is there
> > > > > something else?
> > > > > Thanks in advance.
> > > > >
> > > > > --
> > > > > Snezhana Bekova
> > > > >
> > > > >
> > > >
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Best regards
Vlad