[asterisk-users] Oddity with FFA

Steve Underwood steveu at coppice.org
Mon Mar 10 23:27:36 CDT 2014

Hi Mike,

If the sending machine keeps trying it might be the call has been hung 
up by asterisk before its own acknowledgement message has finished being 
sent. There have been bugs like this in the past, and people can be 
pretty casual about making changes which hang up aggressively. A FAX 
system should really wait for the final DCN message before 
disconnecting, to ensure both sides have seen what they need. Spandsp 
does that, but I am not sure about FFA.


On 03/11/2014 03:03 AM, Mike Diehl wrote:
> Steve,
> I BELIEVE the fax is complete because the fax image is a form that 
> appears to only be a single page.
> But, since FFA isn't providing acknowledgement, the sending fax 
> machine is resending the document multiple times!
> Mike.
> On Mon, Mar 10, 2014 at 12:49 PM, Steve Underwood <steveu at coppice.org 
> <mailto:steveu at coppice.org>> wrote:
>     On 03/11/2014 12:36 AM, Mike Diehl wrote:
>         Hi all,
>         For the most part, we are finding that Fax for Asterisk works
>         pretty
>         well.  However, we have seen some wierdness that we'd like to
>         try to
>         fix.
>         Once in a while, we will get a partial result report for a
>         given fax
>         but when we look at the actual .tiff image, it looks to be
>         complete.
>         This is causing our users to not get a positive
>         acknowledgement when
>         they send the fax.
>         Is there anything we can do to mitigate this?
>         Mike.
>     How do you know the FAX is complete? If a page was received, the
>     sending machine said more pages were to follow, and then it
>     dropped the call, is that a complete FAX?
>     Steve
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