[Freeswitch-users] T.38 gateway and peer/self

Fri Feb 24 10:52:59 MSK 2017

Hello Brian,

this Version of Freeswitch is from 09-Feb-2016. So I think, we should
update.

We need to cover 2 scenarios

  * send fax to SIP Provider(b leg) and have T.38 Re-invite from SIP
    Provider and pass it to a-leg
  * send fax to SIP Provider(b leg), do NOT receive T.38 Re-invite from
    SIP Provider and then do T.38 Gateway in FS.

And no: We cannot foresee, whether the SIp provider will do T.38 and
not. Here in Germany, the main incumbant PSTN provider did not implement
T.38, so it depends on the target number and actual route, if this will
be T.38 or not. A call to a certain number can be T.38 today and
tomorrow it will be T.30 only, as some peering partner changed the
routes in the meantime.

Best regards
Peter

On 02/23/17 20:38, Brian West wrote:
> What revision of FreeSWITCH are you on?  These behaviors have been
> solidified in 1.6.15, Sadly MOST of the details of how it all works is
> locked up in my head, I've just not had the time to write it all down
> and update the documentation.  Can you outline all the scenarios you
> need to cover and if you have the ability know ahead of time which one
> needs to apply?
>
> /b
>
>
> On Thu, Feb 23, 2017 at 8:23 AM, Peter Steinbach <lists at telefaks.de
> <mailto:lists at telefaks.de>> wrote:
>
>     Hello,
>
>     we have the following screnario
>
>       * The caller, a local fax machine (Fax, ATA and Freeswitch) with
>         T.38, is behind a slow line so therefore T.38 is needed here
>       * a central Freeswitch fax server serves as a central gateway to
>         the SIP provider
>       * the SIP provider sometimes reinvites T.38 and sometimes not.
>       * In case, the SIP provider does NOT answer with T.38, the
>         central Freeswitch fax server shall act as a T.38 gateway and
>         transcode between local fax (T.38) and SIP provider (T.30)
>       * In case, the SIP provider does answer with T.38, the central
>         Freeswitch fax server shall pass T.38 to the local fax
>         ,machine (T.38)
>
>     How we set this up
>
>       * according to the wiki we have a dialplan as follows: (this is
>         what CLI shows)
>
>     Dialplan: sofia/internalvpn2/49274xxxxx at 10.7.0.1
>     <mailto:sofia/internalvpn2/49274xxxxx at 10.7.0.1> Action
>     set(fax_enable_t38=true)
>     Dialplan: sofia/internalvpn2/49274xxxxx at 10.7.0.1
>     <mailto:sofia/internalvpn2/49274xxxxx at 10.7.0.1> Action
>     set(fax_enable_t38_request=true)
>     Dialplan: sofia/internalvpn2/49274xxxxx at 10.7.0.1
>     <mailto:sofia/internalvpn2/49274xxxxx at 10.7.0.1> Action
>     set(execute_on_answer=t38_gateway self)
>     Dialplan: sofia/internalvpn2/49274xxxxx at 10.7.0.1
>     <mailto:sofia/internalvpn2/49274xxxxx at 10.7.0.1> Action ring_ready()
>     Dialplan: sofia/internalvpn2/49274xxxxx at 10.7.0.1
>     <mailto:sofia/internalvpn2/49274xxxxx at 10.7.0.1> Action
>     bridge(sofia/gateway/sip.provider.com/xxxxxxxxxxxxxxx at sip.provider.com
>     <mailto:sofia/gateway/sip.provider.com/xxxxxxxxxxxxxxx at sip.provider.com>)
>
>     In all profiles, we have
>     <param name="t38-passthru" value="true"/>
>
>     In case, the SIP provider does NOT answer with T.38, it works. The
>     caller's side is reinvited with T.38, the SIP provider side is T.30
>
>     What the problem is: When the SIP provider' side IS answering with
>     T.38, then (sometimes, when I send it via cli from the local
>     freeswitch near the sending fax machine, it works)
>
>       * caller initiates a call
>       * call is bridged to the SIP provider' side
>       * we receive a T.38 Reinvite from the SIP provider' side
>       * Freeswitch sends Trying back to the the SIP provider' side
>       * Freeswitch logs: set(execute_on_answer=t38_gateway self)
>       * Freeswitch sends a T.38 Reinvite to the caller, establishes
>         T.38 on this side.
>       * But the T.38 Reinvite from the SIP provider' side is not
>         answerered
>       * So the SIP provider' sidehangs up after 10 sec of timeout.
>
>     What are we doing wrong here? Is it possible to act as a t.38
>     passthrough router and a T.38 gateway in the same dialplan?
>
>
>
>     -- 
>     With kind regards
>     Peter Steinbach 
>
>     Telefaks Services GmbH
>     mailto:lists (att) telefaks.de <http://telefaks.de>
>     Internet: www.telefaks.de <http://www.telefaks.de>
>
>
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> -- 
>
> */Brian West/*
> brian at freeswitch.org <mailto:brian at freeswitch.org>
>
> */Twitter: @FreeSWITCH , @briankwest/*
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-- 
With kind regards
Peter Steinbach 

Telefaks Services GmbH
mailto:lists (att) telefaks.de
Internet: www.telefaks.de

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