[Freeswitch-users] {Solved} Anyone using t38modem with FS and Hylafax.

[Tihomir Culjaga]

always disable ECM for fax calls over IP... its the 1st rule of thumb for
VoIP faxing :=)

On Fri, Nov 11, 2011 at 2:48 PM, Alex Crow <acrow at integrafin.co.uk> wrote:

> On 11/11/11 12:52, Alex Crow wrote:
> > If anyone's interested, I've get outbound fax semi-working with this
> setup:
> >
> > <extension name="faxoutviamitel" continue="true">
> > <condition field="destination_number" expression="^9(\d{4})$">
> > <action application="set" data="absolute_codec_string=PCMA"/>
> > <action application="set" data="fax_enable_t38=true"/>
> > <action application="set" data="sip_execute_on_image=t38_gateway self
> > nocng"/>
> > <action application="bridge" data="sofia/external/$1 at 10.10.0.2"/>
> > </condition>
> > </extension>
> >
> > t38modem is started like this:
> >
> > t38modem -ttt -o /var/log/t38modem.log --no-h323 -u t38modem
> > --sip-register t38modem at 192.168.20.245,secret --sip-listen udp\$*:6060
> > --ptty +/dev/ttyT38-1 --route
> > "modem:.*=sip:<dn>@192.168.20.245;OPAL-Force-Fax-Mode=true" --route
> > "sip:.*=modem:<dn>"
> >
> >
> > The remaining problem is that on the receiving end we only have the top
> > centimetre or two of the image. I think this may be a tiff library issue
> > but I'm not sure.
> >
> > Cheers
> >
> > Alex
> >
>
> In the end I had to disable ECM in the Hylafax modem definition for
> t38modem, this was what was causing the image truncation. Odd, because
> both t38modem and spandsp ostensibly support ECM. I'm wondering if I was
> sending audio out directly over TDM rather than via a SIP gateway using
> G.711 then ECM would be OK... probably a timing issue.
>
> Cheers
> Alex
>
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