[asterisk-users] FAX detection in chan_dahdi 1.8.15

[Danny Nicholas]

IIRC correctly this is sort of like the "s" extension; you set up your fax
handler in [default,fax,1].  Not sure how that is done in FreePBX.

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Jeff
LaCoursiere
Sent: Tuesday, August 28, 2012 3:24 PM
To: asterisk-users at lists.digium.com
Subject: [asterisk-users] FAX detection in chan_dahdi 1.8.15

Hi,

I recently replaced a site that was using 1.4.[mumble] with
hylafax/iaxmodem.  They have an RBS T1 and were using about half of their 50
DID numbers for "fax to email".  This all broke with the new system :(

The original chan_dahdi.conf had no mention of "faxdetect", so I assume it
was operating with whatever is the default.  Off?

The new box originally had "faxdetect=no", and I found that all my test
faxes failed with negotiation errors.  When I finally tried
"faxdetect=incoming" test faxes from another machine running hylafax went
through fine, and I thought I was done.

The following week the customer reported that inbound faxes weren't working.
When I looked at the log, I saw lots of these:

chan_dahdi.c:     -- Redirecting DAHDI/24-1 to fax extension

Which in my FreePBX setup eventually goes to a "no service" message and
hangs up.  I've never defined a "fax" extension and don't really know what
that is about.  Turns out that any fax machine that calls ends up following
this path.  If my other hylafax server calls, it follows the normal path and
gets answered by my pool of iaxmodems. I don't really understand the
difference between the two types of calls, first of all.

So it seems from this experience and a recent thread on -users that enabling
faxdetection in chan_dahdi sets up some additional buffering that at least
in my case, in 1.8, seems to be required (without it all inbound faxes fail
from my hylafax server with negotiation problems). 
Unfortunately for me, this also seems to bypass normal DID handling and
sends calls to an undefined "fax extension".

Can anyone shed some light?

Thanks,

j


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