[asterisk-users] Transfer to fax

Larry Moore lmoore at starwon.com.au
Tue Mar 13 17:03:18 CDT 2012

On 14/03/2012 5:18 AM, Mike Diehl wrote:
> So I'm still trying to get this to work... (I'm top posting, but the details
> are below, if you want/need background info)
> I'd like Asterisk to detect incoming faxes and redirect them elsewhere.  The
> details aren't important, as long as I get the detection working.
> I've added this to my sip.conf file.  Probably overkill, but I'll tune it once
> it works:
> [general]
> faxdetect=both
> My sip registrations are all in a Mysql RT database, so I added this column to
> my table:
> faxdetect char(3) default 'no'
> I've set faxdetect to 'yes' for the devices that I expect to be receiving fax
> calls.
> I did a sip reload from the console after adding and updating this column.
> I've added a fax extension to the appropriate context in extensions.conf:
> exten =>  fax,1,noop(I hear a fax!)
> Since most of my dialplan is in an AGI script, I've added this to the code
> that handles my test number:
> $main::agi->answer();
> $main::agi->exec("ringing");
> $main::agi->exec("wait","5");
> So, now that all of this is in place, I call the extension from my fax
> machine... and I don't get any indication on the console that Asterisk heard a
> fax.  My extension simply rings and I answer it.
> What am  missing?

In your peer config set directmedia=no and faxdetect=cng, Asterisk needs 
to be in the path to hear the CNG tones.


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