<html><head><title></title><meta content="MSHTML 6.00.2900.2180"
name="GENERATOR" /></head><body><p>Hi Steve,<br />thanks very much for your
answer!</p><p>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).</p><p>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?<br /><br />Snezhana Bekova<br /><br /><br />Цитат на
писмо от Steve Underwood <steveu@coppice.org>: <br /><br />> Hi
Snezhana, <br />> <br />> Looking at the audio file, there are frame
slips. That is, a clock <br />> synchronisation problem, or a machine
missing interrupts has caused one <br />> or more audio samples to be lost.
Fast modems (anything faster than <br />> 1200bps basically) cannot cope
with even a single lost sample. <br />> <br />> See
http://ww.opencall.org/faq/x26.html and <br />>
http://ww.opencall.org/faq/x29.html <br />> <br />> Regards, <br />>
Steve <br />> <br />> <br />> Snezhana Bekova wrote: <br />> <br
/>> > Hello, <br />> > We use tiff version 3.5.7-2 and
spandsp-0.0.2pre3 with asterisk <br />> > version 1.0 on debian unstable.
I have posted for our problem wtih <br />> > fax. RxFax works and we
receive faxes, but the tiff file is sometimes <br />> > malformed
although the fax seems to be received correctly. Our <br />> > asterisk
server receives calls and faxes from a mobile operator. We <br />> > are
connected to their Cisco router which connects to our asterisk <br />> >
over VoIP that goes inside a Vlan over 100Mbit fiber which passes a <br />>
> few switches. We move asterisk to other server, so it is powerful <br
/>> > enough - it is under load of about 0.01 and CPU load 1% - 2%. So
the <br />> > problem is not the server. <br />> > Maybe the
problem is on the VoIP channel, but we cannot prove it. <br />> > You can
see at http://sbekova.cyberbg.com/fax/ a new example of a <br />> >
received tiff file, some audio log files and debug log. <br />> > Are the
switches and/or routers changing the packet order or is there <br />> >
something else? <br />> > Thanks in advance. <br />> > <br />>
> -- <br />> > Snezhana Bekova <br />> > <br />> > <br
/>>
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