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

[Steve Underwood]

Turning off ECM is equivalent to saying "I use FAX, but I couldn't give 
a damn if they are received".

Steve


On 11/11/2011 09:51 PM, Tihomir Culjaga wrote:
> 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 
> <mailto: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
>     <mailto: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
>     <mailto:t38modem at 192.168.20.245>,secret --sip-listen udp\$*:6060
>     > --ptty +/dev/ttyT38-1 --route
>     > "modem:.*=sip:<dn>@192.168.20.245
>     <http://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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