On 19/12/2012 5:46 AM, Andrew Nowrot wrote:
Hi
I am trying to get faxes to work with Asterisk and ReceiveFax. The
problem is that I am getting only about 60% of success (for example two
of six fax transmissions always fails). The most common errors are
"Error : Unexpected DCN after requested retransmission" and "Error :
Disconnected after permitted retries".
The scenario is like this:
Fax machine ----- ATA ------ (SIP) ------ Asterisk 11.1.0 ----- ReceiveFax
I am using Cisco SPA122 and Sipura SPA2102 (both with the newest
firmware). Both are configured to use T38. I can see that Asterisk and
ATAs negotiate fax T38.
Is this a common issue with these ATAs. I am obviously doing something
wrong. Can anyone point me in to right direction. I can provide the logs
form both good and failing transmission.
BTW
Fax machine to fax machine transmission with these ATAs almost always works.
Cheers
Just a suggestion, check the current T.38 redundancy value in the SPA's,
if it isn't set to 3 then set it to 3.
If Asterisk 11 is still using udptl.conf then check the following;
udptlfecentries = 3
udptlfecspan = 3
You may also want to set;
use_even_ports = yes
Good luck.
Larry.
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