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

[François Delawarde]

I don't see what you can't do with a b2bua in terms of features compared
to a proxy, apart from it (the proxy) being faster and more reliable.


On Thu, 2012-08-30 at 10:31 -0500, Anthony Minessale wrote: 
> indeed she is, b2bua is 2 separate dialogs where proxy has the
> connivence of forwarding 1 dialog.
> 
> 
> On Thu, Aug 30, 2012 at 10:24 AM, François Delawarde
> <fdelawarde at wirelessmundi.com> wrote:
> > The provider's SDP is weird anyway, like if it wanted to send me a fax
> > when putting me on hold (?).
> >
> > My mum always said that there is nothing (even proxy things) that can't
> > be done with a b2bua. Was she wrong?
> >
> > François.
> >
> >
> > On Wed, 2012-08-29 at 11:48 -0500, Anthony Minessale wrote:
> >> 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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