[Freeswitch-users] Faxing transcoding issues.

Thu Aug 4 20:32:17 MSD 2016

Hi,

Your with and without t38 looks same for me - is this by intent?
I'm a little puzzled with your mail - have you every success?

On 04/08/16 17:47, Andrew Cassidy wrote:
> Ok lets go into details a little more:
>
> User <--> FS <--> Provider
>
> When User sends a fax, provider detects tones and renegotiates with t38.
> I can handle this case fine using sip_execute_on_image=t38_gateway
>
> Now, one way or another I also want the a-leg to be t38 if possible. Be
> that via reinvite from FS or sepcifically requested by User. I can't
> make this work at all.
>
> If FreeSWITCH renegotiates with User and User rejects T38, Freeswitch
> does not reinvite with the original codecs.
>
> If User requests t38, fax negotiation fails in some cases, although that
> may be irrelevant.
>
> So, here's my current configuration, that kind of works:
>
> <action application="export" data="fax_enable_t38=true" />
> <action application="export" data="sip_execute_on_image=t38_gateway self
> nocng" />
>
> To test the User end (in this case another FreeSWITCH box for testing):
>
> With T38:
>
> originate {execute_on_answer='t38_gateway
> peer',fax_verbose=true,ignore_early_media=true,fax_ident=xxxx,fax_header='Test
> Fax',absolute_codec_string=PCMA,origination_caller_id_number=xxxx}sofia/gateway/xxxx/xxxx
> &txfax('/home/andrew/test_fax.tiff')
>
> Without T38:
>
> originate {execute_on_answer='t38_gateway
> peer',fax_verbose=true,ignore_early_media=true,fax_ident=xxxx,fax_header='Test
> Fax',absolute_codec_string=PCMA,origination_caller_id_number=xxxx}sofia/gateway/xxxx/xxxx
> &txfax('/home/andrew/test_fax.tiff')
>
> However, the following fails:
>
> originate
> {fax_enable_t38=true,fax_enable_t38_request=true,fax_verbose=true,ignore_early_media=true,fax_ident=xxxx,fax_header='Test
> Fax',absolute_codec_string=PCMA,origination_caller_id_number=xxxx}sofia/gateway/xxxx/xxxx
> &txfax('/home/andrew/test_fax.tiff')
>
> I think this configuration will work for now, the User end can decide
> freely if they want to send t38 requests to FS or not.
>
> On 4 August 2016 at 14:39, Brian West <brian at freeswitch.org
> <mailto:brian at freeswitch.org>> wrote:
>
>     You also do NOT want pass thru set if you're doing this.
>
>     On Thu, Aug 4, 2016 at 4:02 AM, Andrew Cassidy
>     <andrew at cassidywebservices.co.uk
>     <mailto:andrew at cassidywebservices.co.uk>> wrote:
>
>         Hi all,
>
>         Just realised the server I'm having issues with is an old wheezy
>         server running 1.4.26. I will test with latest and report back.
>
>         Kind regards,
>
>         On 4 August 2016 at 09:55, Andrew Cassidy
>         <andrew at cassidywebservices.co.uk
>         <mailto:andrew at cassidywebservices.co.uk>> wrote:
>
>             Good morning all,
>
>             I've been playing with faxing and t38 over the last few
>             days. I use a wholesale provider who detects and reinvites
>             for t38, and have implemented the same in my systems.
>             Passing t38 through unmodified is not an issue.
>
>             The issue I do have, is in the event that the sender refuses
>             the reinvite, I'd like freeswitch to transcode. In theory,
>             this is set up correctly, but see this error message
>             repeated over and over and ultimately the fax fails:
>
>             [DEBUG] mod_spandsp_fax.c:1756
>             sofia/external/xxx at provider.com <mailto:xxx at provider.com>
>             Error decoding UDPTL (172 bytes)
>
>             Every other scenario I have worked through is working fine.
>
>             For reference, the fax-specific dialplan entries:
>
>             <action application="export" data="fax_enable_t38=true"/>
>             <action application="export"
>             data="fax_enable_t38_request=true"/>
>             <action application="export" data="t38_passthru=true"/>
>             <action application="export"
>             data="nolocal:sip_execute_on_image=t38_gateway self" />
>             <action application="set"
>             data="execute_on_answer=t38_gateway peer" />
>
>             Thanks in advance.
>
>             --
>             *Andrew Cassidy BSc (Hons) MBCS SSCA*
>             Managing Director
>
>             03303 880 960
>             <tel:03303%20880%20960> andrew at cassidyweb.co.uk
>             <mailto:andrew at cassidywebservices.co.uk> www.cassidyweb.co.uk <http://www.cassidywebservices.co.uk>
>
>
>
>
>         --
>         *Andrew Cassidy BSc (Hons) MBCS SSCA*
>         Managing Director
>
>         03303 880 960 <tel:03303%20880%20960> andrew at cassidyweb.co.uk
>         <mailto:andrew at cassidywebservices.co.uk> www.cassidyweb.co.uk
>         <http://www.cassidywebservices.co.uk>
>
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>     --
>
>     */Brian West/*
>     brian at freeswitch.org <mailto:brian at freeswitch.org>
>
>
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> --
> *Andrew Cassidy BSc (Hons) MBCS SSCA*
> Managing Director
>
> 03303 880 960 andrew at cassidyweb.co.uk
> <mailto:andrew at cassidywebservices.co.uk> www.cassidyweb.co.uk
> <http://www.cassidywebservices.co.uk>
>
>
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-- 
Serge S. Yuriev
Lead VoIP engineer