[Asterisk-Users] Asterisk mangling faxes

[Don Pobanz]

On Wednesday, March 10, 2004 12:19 PM, Jim Sneeringer [SMTP:j at snee.us] 
wrote:
> Darren,
>
<snip>
>
> Also, why should Asterisk introduce a lot of noise? (Faxes work fine 
without
> Asterisk or with the old phone system.) I'm using a 2.4GHz Pentium 4
> with two X100P's and two TDM400P's. Faxes are garbled even when there 
is no
> other load, and nothing else has changed except to replace the old 
switch
> with Asterisk. I have tried attaching the fax to different cards and 
using
> different FXO lines, and faxes are always garbled, so I don't think 
it
> is some kind of sample defect in the hardware.
>

I have a T400P card and one of the T1 ports is attached to a Zhone 
channel bank. I ran into some difficulty with faxes and after some 
trouble shooting found that a different channel bank (Adtran TA750) 
worked fine. (Maybe there was something introduced in the a/d 
conversion of the Zhone bank). I have phone lines off of this Zhone 
channel bank and phone conversations sound great, however faxes (and 
modems) seem less reliable. Modem connections connect but usually 
around 9600. With the Adtran bank connection speed were more line 
21400.

> What could I try that might reduce this noise?

Sorry I can't really help here.

> Jim

Don Pobanz