[Asterisk-Dev] SpanDSP and some fax machines...

[Steve Underwood]

Matt Ranney wrote:

> On Mar 22, 2005, at 10:07 AM, Brian West wrote:
>
>> Has anyone found a fix for spandsp pre10 .. I still have some faxes 
>> that come in smeared.  Has anyone else seen this or came up with a fix?
>
>
> Yes, I just started noticing this today.  pre10 has been handling 
> nearly all incoming faxes just fine, except for ones from a certain 
> specific fax machine.  This same fax machine can send to our other 
> regular fax machines on POTS lines without any problems.
>
> I've tracked down one of the bad senders and asked them for the exact 
> make and model of their fax machine.  I'll report that when I get it 
> in case it helps.
>
> Is there any way to gather relevant debugging info for this problem 
> without restarting asterisk?

I have posted this same procedure a few time. In t30.c uncomment the 
first line, and rebuild the software. Now when FAXes are processed the 
software will generate files of the audio in /tmp. Try a problem FAX 
machine, and send me the pair of audio files (one for RX and one for 
Tx). I think their naming is fairly obvious.

Regards,
Steve