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

[Anthony Minessale]

As long as you understand the difference between the fact that
messages passing across a bridge on a b2bua is much more complex than
on a proxy and will not match up 100%

On Thu, Aug 30, 2012 at 11:09 AM, François Delawarde
<fdelawarde at wirelessmundi.com> wrote:
> 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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>> >
>> > 
>> > 
>> >
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>>
>>
>
>
>
> _________________________________________________________________________
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> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> 
> 
>
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>
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-- 
Anthony Minessale II

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