[Asterisk-Users] fax over tdm400p

[Andrew Kohlsmith]

On January 18, 2005 03:24 am, Sergio wrote:
> I'm unable to get faxes working over tdm400p (4fxs modules)
> Too many errors sending and receiving faxes with an analog fax
> 1) echocancel=no on the zap channels
> 2) ztmonitored the channel for a good/low audio volume

I have two fax machines, a Canon IR3300 and an old Epson laser fax.  I also 
have a stamp machine that calls in for more money.

When these devices were connected to * via a T100P and Adit600 channel bank 
everything worked *great*.  I could send and receive faxes without issue, and 
the stamp machine had no trouble.

I got rid of the channel bank since I use a PRI connection between our KSU and 
* now.  I bought a TDM430P for these three devices.

I can now send faxes just fine, but I cannot for the life of me get reliable 
fax reception, nor can I get the stamp machine to work well.  I took out the 
T100P so there was only one TDM card in the machine (in case there was a 
problem with interrupts or something) but that was not the problem.  There is 
just something about either the TDM400P card itself or its driver which makes 
fax reception (and modem communications to a greater extent) unreliable.

As I said, fax transmission works great.  Weird eh?

My solution was to use app_rxfax() and some glue to have faxes automatically 
converted to PDFs and placed in a samba share.

-A.