[Freeswitch-users] t38_gateway self - no re-Invite?

[Clemens Ebentheuer]

Hi

My way:

internal:t38(zoiper) -> FS -> external:g711 (provider with no t38 support)

I tried all versions of set and export and peer and self - but no luck- for my understanding it should work with set t38_gateway self

Set because of aleg and self because FS acts as the T38 fax "receiver".

Am I wrong here?

My dialplan: 
<extension name="0-sil-p000016" >
   <condition field="destination_number" expression="^0(.*)$">
       <action application="set" data="fax_enable_t38=true"/>
       <action application="set" data="execute_on_answer=t38_gateway self"/>
       <action application="bridge" data="sofia/gateway/sil-p000016/$1"/>
   </condition>
</extension>
(testet with and without fax_enable_t38_request=true)

Thx,


Clemens




> have you tried the self vs peer args to the t38 gateway app, maybe you
> have it configured backwards.
> 
> 
> On Fri, Feb 25, 2011 at 4:11 PM, Clemens Ebentheuer <ce at kapper.net>
> wrote:
> > Hi,
> >
> >> It can be, that in your case the device is simply detecting the FAX
> >> tones itself before FS does. When the device sends a ReINVITE to FS
> FS
> >> has no chance to detect CNG anymore and hence never switch to t38.
> >
> > Maybe you´re right here - or zoiper
> (http://www.zoiper.com/softphone/classic/ which is a softphone with
> only t38 fax support [no g711 fallback]) sends the reinvite every time
> after answer when it is sending a fax.
> >
> >>
> >> Just trace the sending FAX-Device for SIP-Signalling and you should
> se
> >> a
> >> ReINVITE from FAX-device to FS, if this is true.
> >
> > Here is a debug with siptrace: http://pastebin.freeswitch.org/15439
> >
> > If I read the logs in a right way:
> > then FS executes t38_gateway on answer -
> > sends a 200 OK to zoiper -
> > zoiper answers with ACK and then reinvites with t38 -
> > FS answers 100 Trying-
> >
> > And nothing is happening. I´m not sure if this is the scenario you
> describe below, but shouldn´t FS answer with a t38 sdp so zoiper knows
> where to send it´s t38 fax??
> >
> >>
> >> You should check your t38-Device configuration. See if it is able to
> >> let
> >> the t38 fax detection job only by FS.
> >>
> >> Establish a call from the Fax device to a phone. Can your hear the
> CNG
> >> signal when you pickup the phone? Does it suddenly stop? If so, the
> FAX
> >> device or FS/mod_spandsp has sent a t38-ReINVITE.
> >>
> >> Do you see something like "media Bug removed" in FS console (DEBUG
> >> level) after 20 seconds of listening to 1100Hz? If so, then FS
> failed
> >> to
> >> detect CNG, hence it never received it (or for too short to detect
> it).
> >>
> >> On my Grandstream ATAs this wasn't possible, so I had to search for
> a
> >> hack.
> >>
> >> Hope this will light up your problems a little bit.
> >>
> >>
> >> > If so, I´m wondering why rxfax in t38 mode is working fine then -
> >> with re-invite.
> >> Can't tell you with this, never tried that. sorry.
> >
> > Thx,
> >
> > clemens
> >
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> 
> 
> 
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> Anthony Minessale II
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