[Asterisk-Users] RxFax - tiff problem

[Snezhana Bekova]

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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