[Freeswitch-users] Faxing with FreeSWITCH

[Tim St. Pierre]

The fax detect function starts listening for fax tones while the call
continues.  You are right, in that it is a non-blocking function.

What you probably need to do, after making sure that media is
established, is call fax detect, then give the caller something to do
while you wait for a possible fax tone.  You could just play silence to
the caller for a few seconds, unless there was something more relevant
to do.  I believe that the original intent of fax detect was to be
invoked just before an IVR was run, so that a voice caller would just
listen to the menu, but a fax would start making tones that could then
be detected, transferring the call to the named extension where it would
be answered as a fax.

Hope that helps!

On 14-03-24 01:49 PM, bruce at sqls.net wrote:
>  
> Hello! I'm working on setting up a FreeSWITCH/Flowroute fax server. The
> server is connected without any nat on a 20MB fiber internet connection.
> I've built some lua scripts that allow me to receive and send faxes and
> log all the faxes to a sqlite database. I even have a management script
> that can be called from the fs_cli to add fax2email routes and adjust
> settings. It's still a pretty rough implementation but overall it's
> working fairly well but I have two main questions that I hope someone
> could help me with.
>  
> 1) I would like to detect "voice calls" or maybe I want to detect fax
> calls? There's a dialplan function to listen for and detect a fax caller
> but I'm having trouble implementing it in my lua script. It seems it's a
> non-blocking function, maybe? Because it just walks right over that line
> instead of waiting and listening for any fax tones. I thought it would
> block the script for x seconds and listen for a fax tone and return a
> result based on what it found. Can someone help me accomplish something
> similar to that?
>  
> 2) So far, by far... my most common error is "The call dropped
> prematurely". I'm not sure how to start debugging the error to figure
> out what's causing it and how (if I can) solve it. I do have pcap's of
> the calls from pcapsipdump and I also have the freeswitch log of each
> call (my lua script pulls and saves that for each fax call). I've opened
> the pcap files up in wireshark but I don't know what I'm looking for and
> I think that might be over my head at the moment. Can anyone give me any
> help on what this error is normally caused by or what I could look for
> and/or test?
>  
> Here are a couple of example logs that ended with "The call dropped
> prematurely".
> http://bmts.us/faxlogs/FAX-2e913a50-3a4f-4abc-9882-a323a97e5138.log
> http://bmts.us/faxlogs/_FAX-59d02d9d-c4ba-44c2-8edd-a1c9142c7c1c.log_
> <http://bmts.us/faxlogs/FAX-59d02d9d-c4ba-44c2-8edd-a1c9142c7c1c.log>
> __
> __
>  
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> 
> 
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