[asterisk-users] Transfer to fax

[Danny Nicholas]

#1 you might need a progress() statement after answer
#2 what does sip show peer xxx look like on this peer?

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Mike Diehl
Sent: Tuesday, March 13, 2012 4:18 PM
To: asterisk-users at lists.digium.com
Subject: Re: [asterisk-users] Transfer to fax

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?

TIA,
Mike Diehl.


On Friday 24 February 2012 4:22:07 pm Kevin P. Fleming wrote:
> On 02/24/2012 05:20 PM, Mike Diehl wrote:
> > On Friday 24 February 2012 4:06:19 pm Kevin P. Fleming wrote:
> >> On 02/24/2012 05:00 PM, Mike Diehl wrote:
> >>> On Friday 24 February 2012 3:17:04 pm Mike Diehl wrote:
> >>>> On Friday 24 February 2012 2:39:48 pm Kevin P. Fleming wrote:
> >>>>> On 02/24/2012 03:32 PM, Mike Diehl wrote:
> >>>>>> Hi all,
> >>>>>> 
> >>>>>> I've got a user that has one phone number an wants to be able 
> >>>>>> to us it for both voice and fax.
> >>>>>> 
> >>>>>> When a fax call comes in, he wants to do some incantation on 
> >>>>>> the keypad and have the call go to the fax machine.
> >>>>>> 
> >>>>>> As I see it, he has 3 options.
> >>>>>> 
> >>>>>> 1.  (blind?) Transfer it to the fax extension.
> >>>>>> 
> >>>>>> 2.  Use features.conf to create a key sequence, say *2, to 
> >>>>>> dial/transfer to a fax extension.
> >>>>>> 
> >>>>>> 3.  Use fax detect (SIP) to do it automatically.  However I'm 
> >>>>>> also using FFA, so I suspect these are mutually exclusive.
> >>>>> 
> >>>>> They are not. Enabling faxdetect should do exactly what you 
> >>>>> want; it will redirect the call to the 'fax' extension in the 
> >>>>> current context, and you can then Dial() your FAX machine (or 
> >>>>> send the call to ReceiveFAX).
> >>>> 
> >>>> Thank you.  Then, that's what I'll do.
> >>> 
> >>> On second though, I think my suggestion that FFA and fax detect 
> >>> were mutually exclusive stemmed from the idea that a call that was 
> >>> being originated/answered/handled by FFA would have it's call 
> >>> disconnected and redirected by fax detect.
> >>> 
> >>> If this is the case, it changes my dial plan logic, and I'm not 
> >>> sure I fully understand what changes I'll need to make.
> >>> 
> >>> For all I know, it might even simplify things by isolating all fax 
> >>> handling in one block.
> >> 
> >> Well, first you should not have faxdetect enabled on outbound channels.
> >> That takes care of the 'originating' part.
> >> 
> >> If you have an inbound channel that you *know* you are sending to 
> >> ReceiveFAX, then you can just disable faxdetect on that channel 
> >> before doing so (this is why we made 'faxdetect' configurable from 
> >> the dialplan). Alternatively, you can just let calls that you 
> >> *know* are going to go to ReceiveFAX (dedicated FAX DIDs, for example)
just 'idle'
> >> in the dialplan listening to silence until faxdetect kicks in and 
> >> sends them to ReceiveFAX.
> >> 
> >> Note that the usage of FFA is not relevant here; whether you are 
> >> using Fax for Asterisk, the free version of it, or res_fax_spandsp, 
> >> the behavior and scenarios would be the same.
> > 
> > Very nice.
> > 
> > Sounds like I need to add a faxdetect column to my SIP real-time 
> > configuration. Once I've done a sip reload or pruned/loaded my user 
> > agents, I should be good to go!
> > 
> > Didn't know faxdetect was configurable in the dialplan...  Pointer 
> > to how to do it?
> 
> The CHANNEL() dialplan function with the 'faxdetect' option. Not sure 
> which releases have it; it might only be Asterisk 10.

-- 

Take care and have fun,
Mike Diehl.

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