[Freeswitch-dev] [Freeswitch-users] Doubts about T38 passthru

[Anthony Minessale]

Because FS is a b2bua it probably only snaps to what type of channel
the B leg is.
FS is not a proxy and only has modest ability to emulate a few proxy behaviors.


On Wed, Aug 29, 2012 at 11:43 AM, François Delawarde
<fdelawarde at wirelessmundi.com> wrote:
> Hi,
>
> Sent to the wrong ML, this probably is more a dev question:
>
> On Wed, 2012-08-29 at 10:46 +0200, François Delawarde wrote:
>> Hi,
>>
>> Whenever my provider puts me on hold, it reINVITES with an SDP
>> containing both audio (sendonly) and image media like so:
>>
>> ...
>> m=audio 5320 RTP/AVP 18 3 8 0 96
>> c=IN IP4 <ip_address>
>> a=rtpmap:18 G729/8000
>> a=rtpmap:3 GSM/8000
>> a=rtpmap:8 PCMA/8000
>> a=rtpmap:0 PCMU/8000
>> a=sendonly
>> a=rtpmap:96 telephone-event/8000
>> m=image 5322 udptl t38
>> c=IN IP4 <ip_address>
>> a=T38FaxVersion:0
>> a=T38MaxBitRate:14400
>> a=T38FaxUdpEC:t38UDPRedundancy
>> a=T38FaxRateManagement:transferredTCF
>>
>>
>> Not sure if it's a non-standard SDP, but that's what I get. Now when
>> t38_passthru=true, it only forwards the "image" part to the other leg.
>> When t38_passthru=false, it only forwards the "audio" part.
>>
>> Is there a way to make t38_passthru forward the audio part as well? Or
>> should I just change to a better provider?
>
> Thanks,
> François.
>
>
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-- 
Anthony Minessale II

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