[Asterisk-Users] fax detection: false positive

[Tilghman Lesher]

On Friday 26 December 2003 13:42, john lawler wrote:
> Hi guys,
>
> I just moved from Asterisk release 0.5.0 to CVS 2003-12-22, and
> after overcoming a few changes in my configuration, I encountered
> one problem that I couldn't shake that was working fine in 0.5.0.
>
> It's the fax detection.  I just have a simple extension setup like
> this:
>
> 	exten => fax,1,Dial(Zap/4,30,tr)
> 	exten => fax,2,Hangup
>
> in my main incoming context.  This used to work fine, I don't think
> I ever had a false positive or negative, but now just about every
> call (possibly every call) that comes in when I've got that
> extension defined rolls to my fax machine on Zap/4 immediately.

Uncomment OLD_DSP_ROUTINES near the top of dsp.c, recompile,
install, and restart.

The newer DSP routines are used to fix a type of signalling on E&M
lines.

-Tilghman