[Freeswitch-users] Faxing with FreeSWITCH

Tue Mar 25 01:04:38 MSK 2014

You can use something like this:

<action application="set" data="execute_on_answer=spandsp_start_fax_detect
transfer 'FAX_DETECTED XML default' 6"/>

This way the call will be transferred only if a fax signal is detected,
otherwise, you can continue playing prompts or transferring the call
somewhere else after the 6 seconds.

Also you don't need to play silence, just start the fax detection. The
silence would only delays the fax detection. You can play a prompt or ring
back tone for 6 seconds or so and if fax is not detected, handle it as a
non-fax call.

Regards,
Ali Pey

On Mon, Mar 24, 2014 at 5:19 PM, <bruce at sqls.net> wrote:

>
> Ah, thanks for the info on fax detect..  With that and reading some more
> examples/docs I tried this..
>
> session:answer()
> session:execute("playback", "silence_stream://2000")
> session:execute("spandsp_start_fax_detect", "rxfax '/tmp/FAX-" .. uuid
> .. ".tif'")
> session:sleep(15000);
> session:hangup()
>
>
> Which seems to work.  Once it detects a fax it fire's off the rxfax app.
>   I'm not sure if maybe there's a better method to do this or not.  This
> doesn't really leave me a variable saying that no fax was detected
> outside the lack of result variables from rxfax but maybe that's good
> enough.  Any ideas on a better solution, anyone? :)
>
> On a side note.  Does anyone know -why- the playback silence_stream is
> needed? Or is it not needed at all? I see that in almost every example
> on using FreeSWITCH faxing but I'm not sure what it's purpose is.
> Thanks.
>
>
> ------ Original Message ------
> From: "Tim St. Pierre" <fs-list at communicatefreely.net>
> To: freeswitch-users at lists. <freeswitch-users at lists.freeswitch.org>
> freeswitch.org<https://contactmonkey.com/api/tracker?cm_session=ee64b0c4-b3ea-4168-b533-9d4a1ad93dc5&cm_type=link&cm_link=19bd6695-7e80-47d2-a671-407cd1f61276&cm_destination=http://freeswitch.org>
> Sent: 3/24/2014 3:15:08 PM
> Subject: Re: [Freeswitch-users] Faxing with FreeSWITCH
>
> >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".
> >>  <https://contactmonkey.com/api/tracker?cm_session=ee64b0c4-b3ea-4168-b533-9d4a1ad93dc5&cm_type=link&cm_link=b9c10772-5827-46aa-98a5-23a2330c7e13&cm_destination=http://bmts.us/faxlogs/FAX-2e913a50-3a4f-4abc-9882-a323a97e5138.log>
> http://bmts.us/faxlogs/FAX-<https://contactmonkey.com/api/tracker?cm_session=ee64b0c4-b3ea-4168-b533-9d4a1ad93dc5&cm_type=link&cm_link=e9d443c1-f146-415d-83d7-3361d17f9462&cm_destination=http://bmts.us/faxlogs/FAX->
> 2e913a50-3a4f-4abc-9882-a323a97e5138.log
> >>  <https://contactmonkey.com/api/tracker?cm_session=ee64b0c4-b3ea-4168-b533-9d4a1ad93dc5&cm_type=link&cm_link=5c914ed7-f254-440c-8e6d-7d8ed891765a&cm_destination=http://bmts.us/faxlogs/_FAX-59d02d9d-c4ba-44c2-8edd-a1c9142c7c1c.log_>
> http://bmts.us/faxlogs/_FAX-<https://contactmonkey.com/api/tracker?cm_session=ee64b0c4-b3ea-4168-b533-9d4a1ad93dc5&cm_type=link&cm_link=840d221b-357a-44b0-982b-1533c317dadb&cm_destination=http://bmts.us/faxlogs/_FAX->
> 59d02d9d-c4ba-44c2-8edd-a1c9142c7c1c.log_
> >>  <<https://contactmonkey.com/api/tracker?cm_session=ee64b0c4-b3ea-4168-b533-9d4a1ad93dc5&cm_type=link&cm_link=4c319ad8-db28-43ff-9060-f27b7d35758a&cm_destination=http://bmts.us/faxlogs/FAX-59d02d9d-c4ba-44c2-8edd-a1c9142c7c1c.log>
> http://bmts.us/faxlogs/FAX-<https://contactmonkey.com/api/tracker?cm_session=ee64b0c4-b3ea-4168-b533-9d4a1ad93dc5&cm_type=link&cm_link=d077bb12-78d7-4a2f-8313-bb4dc3d3d6c5&cm_destination=http://bmts.us/faxlogs/FAX->
> 59d02d9d-c4ba-44c2-8edd-a1c9142c7c1c.log>
> >>  __
> >>  __
> >>
> >>
> >>
> >>
> >>
> >>_________________________________________________________________________
> >>  Professional FreeSWITCH Consulting Services:
> >>  consulting at freeswitch.org
> >>  http://www.<https://contactmonkey.com/api/tracker?cm_session=ee64b0c4-b3ea-4168-b533-9d4a1ad93dc5&cm_type=link&cm_link=95dc4d0c-6f2b-43c8-95a0-dc34cc845f63&cm_destination=http://www.freeswitchsolutions.com>
> freeswitchsolutions.com<https://contactmonkey.com/api/tracker?cm_session=ee64b0c4-b3ea-4168-b533-9d4a1ad93dc5&cm_type=link&cm_link=ba6a5ef6-71d4-41b7-acd3-e752dca2ad39&cm_destination=http://freeswitchsolutions.com>
> >>
> >>  
> >>  <https://contactmonkey.com/api/tracker?cm_session=ee64b0c4-b3ea-4168-b533-9d4a1ad93dc5&cm_type=link&cm_link=a1006375-44ae-46ee-8787-772991abd4ca&cm_destination=>
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> >>
> >>  Official FreeSWITCH Sites
> >>  <https://contactmonkey.com/api/tracker?cm_session=ee64b0c4-b3ea-4168-b533-9d4a1ad93dc5&cm_type=link&cm_link=d4f57c62-7824-4c24-b573-07a2ba1a3dc5&cm_destination=http://www.freeswitch.org>
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> >>  <https://contactmonkey.com/api/tracker?cm_session=ee64b0c4-b3ea-4168-b533-9d4a1ad93dc5&cm_type=link&cm_link=2d3bded0-aac4-4123-8e89-373db3d2bea7&cm_destination=http://www.cluecon.com>
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> >>
> >>  FreeSWITCH-users mailing list
> >>  FreeSWITCH-users at lists. <FreeSWITCH-users at lists.freeswitch.org>
> freeswitch.org<https://contactmonkey.com/api/tracker?cm_session=ee64b0c4-b3ea-4168-b533-9d4a1ad93dc5&cm_type=link&cm_link=bf398a8b-bb6e-4bb0-b6c5-1055a0bda5a0&cm_destination=http://freeswitch.org>
> >>  <https://contactmonkey.com/api/tracker?cm_session=ee64b0c4-b3ea-4168-b533-9d4a1ad93dc5&cm_type=link&cm_link=39ee4396-a982-4515-a1e2-ea3c1cd6abe7&cm_destination=http://lists.freeswitch.org/mailman/listinfo/freeswitch-users>
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> mailman/listinfo/freeswitch-users
> >>
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> options/freeswitch-users
> >>  <https://contactmonkey.com/api/tracker?cm_session=ee64b0c4-b3ea-4168-b533-9d4a1ad93dc5&cm_type=link&cm_link=82256ec1-4f59-4f16-8af7-5d8870030f25&cm_destination=http://www.freeswitch.org>
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> >>
> >
> >_________________________________________________________________________
> >Professional FreeSWITCH Consulting Services:
> >consulting at freeswitch.org
> >http://www.<https://contactmonkey.com/api/tracker?cm_session=ee64b0c4-b3ea-4168-b533-9d4a1ad93dc5&cm_type=link&cm_link=97771563-d3ee-47de-87fb-d566fd6937fb&cm_destination=http://www.freeswitchsolutions.com>
> freeswitchsolutions.com<https://contactmonkey.com/api/tracker?cm_session=ee64b0c4-b3ea-4168-b533-9d4a1ad93dc5&cm_type=link&cm_link=1a88c0ca-437b-4b9b-a155-40d0537ec685&cm_destination=http://freeswitchsolutions.com>
> >
> >
> ><https://contactmonkey.com/api/tracker?cm_session=ee64b0c4-b3ea-4168-b533-9d4a1ad93dc5&cm_type=link&cm_link=55239f20-e973-47ca-bad0-58db3cd85348&cm_destination=>
> <https://contactmonkey.com/api/tracker?cm_session=ee64b0c4-b3ea-4168-b533-9d4a1ad93dc5&cm_type=link&cm_link=eaf5dce9-4806-4300-b491-446c6b40826c&cm_destination=>
> >
> >Official FreeSWITCH Sites
> ><https://contactmonkey.com/api/tracker?cm_session=ee64b0c4-b3ea-4168-b533-9d4a1ad93dc5&cm_type=link&cm_link=c44a6823-7d45-4ddc-8c5d-397029d000fd&cm_destination=http://www.freeswitch.org>
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> >
> >FreeSWITCH-users mailing list
> >FreeSWITCH-users at lists. <FreeSWITCH-users at lists.freeswitch.org>
> freeswitch.org<https://contactmonkey.com/api/tracker?cm_session=ee64b0c4-b3ea-4168-b533-9d4a1ad93dc5&cm_type=link&cm_link=ee6d86b2-99d2-4c54-b837-b8ae11c8f629&cm_destination=http://freeswitch.org>
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>
>
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.<https://contactmonkey.com/api/tracker?cm_session=ee64b0c4-b3ea-4168-b533-9d4a1ad93dc5&cm_type=link&cm_link=5861ba48-883c-456c-b1d0-654b9757794a&cm_destination=http://www.freeswitchsolutions.com>
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>
> 
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