[Asterisk-Users] RxFax - tiff problem

[Steve Underwood]

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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