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

[François Delawarde]

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.