[Freeswitch-users] Faxing transcoding issues.

Andrew Cassidy andrew at cassidywebservices.co.uk
Fri Aug 5 11:57:54 MSD 2016 

Sorry I wrote it while testing which is why the overall tone changes
throughout.

The without should should be without the execute_on_answer.

I have a solution that works well enough,   In that I have a documentable
configuration that should work for all use cases on my particular
implementation. If the user wants to use T38, they need to request it.

On 5 August 2016 at 07:56, Andrew Cassidy <andee at bytz.co.uk> wrote:

> Sorry I wrote it while testing which is why the overall tone changes
> throughout.
>
> The without should should be without the execute_on_answer.
>
> I have a solution that works well enough,   In that I have a documentable
> configuration that should work for all use cases on my particular
> implementation. If the user wants to use T38, they need to request it.
>
> On 4 Aug 2016 17:37, "Serge S. Yuriev" <me at nevian.org> wrote:
>
>> 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=xxx
>> x,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=xxx
>> x,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>
>> >
>> >
>> >     */Twitter: @FreeSWITCH , @briankwest/*
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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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>> >
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>>
>> --
>> Serge S. Yuriev
>> Lead VoIP engineer
>>
>>
>> _________________________________________________________________________
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>>
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>


-- 
*Andrew Cassidy BSc (Hons) MBCS SSCA*
Managing Director

03303 880 960 andrew at cassidyweb.co.uk <andrew at cassidywebservices.co.uk>
www.cassidyweb.co.uk <http://www.cassidywebservices.co.uk>
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