[Freeswitch-users] Faxing problems if B leg offers T.38

[David Ponzone]

Rob,

perhaps you should not consider T38 is 100% interoperable.
You may tell us what ATA is that, because some of them are nice piece of junk.

David Ponzone  Direction Technique
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Le 23/05/2011 à 20:51, Rob Morin a écrit :

> I’m having problems faxing if the B leg offers T.38.  Several scenarios, but always the same result.
>  
> First, the architecture
>  
> FAX à ATA (T.38 optional) à FS à Carrier  à Destination (Possibly another carrier (PSTN) and the fax machine)
>  
> On my ATA, T.38 is enabled (Auto Detect).
>  
> If the destination supports T.38, the Carrier will offer it to Freeswitch. If the Destination doesn’t support T.38, the B leg doesn’t offer it and the faxes go through.
>  
> I’ve set Freeswitch as:
>       <action application="set" data="fax_enable_t38=true"/>
>       <action application="export" data="t38_passthru=true"/> 
> When that’s the case, and the B leg offers T.38, Freeswitch passes through the offer and the ATA responds, 3 times. But the response never gets sent to the B leg, so it terminates the call after about 30 seconds.
>  
> When I set Freeswitch as:
>       <action application="set" data="fax_enable_t38=false"/>
> The B leg still offers T.38 if its other side is capable. Freeswitch doesn’t pass the offer through and the B leg terminates the call after about 30 seconds.
>  
> I’m running on a recent git ( FreeSWITCH Version 1.0.head (git-86d757d 2011-05-17 22-51-47 -0500) ).
>  
> I’ve had no success attempting to configure FS as a gateway. Frankly, T.38 “passthrough” has had the most success, mostly when the other ends aren’t T.38 capable and it stays in G711u.
>  
> Is there something else I need to do to enable T.38 in passthrough mode? 
>  
> Thank you,
> Rob Morin
>  
> PS – I can provide tcpdumps of this, or whatever else is necessary.
>  
>  
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