Hi guys, thanks for answers.
That could seem counter-intuitive but it is not. Not to mention the fact
that information technology is not science, the solution to broken faxes
is to lower down speed. This works even with normal telco lines even if
you DO NOT have a pbx (telco technicians even say not to make faxes pass
thru your PBX). I could ask my customer's telco to lower the speed down
but it depends on the guy working at the call-center...sometime you talk
to dummy people who ARE sure it is impossible. But it is not. So, I do
not want to spend days to convince people working at that telco
call-center that what I'm asking is feasible and I do not want to tell
my customer to tell their customer to lower their faxes speed (before
installing our PBX they were able to send perfect faxes so, why should
they?).
My idea was to tell iaxmodem not to accept fast speed rates so the fax
machine on the other side should be forced to negotiate a slower speed
as if my customer fax weren't virtual as iaxmodem is but a real one.
I suspect that the problem is about the primary lines because I tested
iaxmodem many times on my LAN and it is (surprisingly :) ) working fine
(10 good received faxes out of 10 sent!!!) but, as you may know, talking
to telco technician is a nightmare....they always say problems are
always on the PBX side... :(
Moreover, after sending a fax, the fax machine beeps correctly as the
fax was correctly sent without corruption. :o
I hope I have made my point but I'll try do dig deeper inside the
problem as you suggested me.
Thank you. :)
Giorgio
On 05/17/2012 04:02 PM, Tim Nelson wrote:
----- Original Message -----
----- Original Message -----
Hi Steve,
you are telling me there is no way to set a particular speed on my
iaxmodem in order to force the sender speed?
I have some problems with a customer who gets malformed faxes even
if
no
error occurs. Since I cannot tell the sender to lower its fax
speed,
my
idea is to force my iaxmodem to a lower fixed speed so the sender
is
oblidged to negotiate at that speed (or lower, of course) without
the
customer could realize it, at least at first. :)
There is no ATA in the middle (I'm using it for my tests but my
customer
does not have any), all faxes are received thru a primary channel
to
a
bunch of iaxmodems. Sometimes some faxes are corrupted, that's why
I
thought to lower the speed. I could try to disable ECM but that's
even
harder to do (found nothing on internet).
You're getting corrupted fax data and want to solve that problem by
*disabling* ECM? That seems counter-intuitive to me...
How are your fax calls coming into your system
(PSTN->???->Asterisk->IAXmodem->Hylafax)? If you have VoIP somewhere
in the call path, you'll likely keep bashing your head on the table
trying to fix problems that will never go away. Also, don't be
afraid to recognize sometimes your side (as the receiver) is working
perfectly well, and sometimes there just isn't anything you can do
about senders on bad lines/sending over VoIP/etc. The quality of a
fax session is only as good as the weakest link contained within
that session, including the call path from sender to receiver.
Also, while there are some brilliant experienced people here on the Asterisk
lists, you may have better luck and traction by heading over to the iaxmodem
and hylafax mailing lists. Or, at least you may get a different audience with
different ideas/experience.
--Tim
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