[Freeswitch-users] Cannot receive fax with T.38

Boris Kovalenko boris at tagnet.ru
Sat Apr 2 20:32:00 MSD 2011


Hello!

     Have You compiled and loaded mod_spandsp?

> Hi everybody,
>
> I am stuck for several days trying to receive a fax using T.38
>
> Based on the instructions in the wiki, I use the following dialplan:
>
> <action application="answer" />
> <action application="playback" data="silence_stream://2000"/>
> <action application=set data="fax_enable_t38=true"/>
> <action application=set data="fax_enable_t38_request=true"/>
> <action application="rxfax" data="/tmp/rxfax-${uuid}.tif"/>
> <action application="hangup"/>
>
> When I do that, when rxfax is executed, the following appears on the 
> console:
>
> 2011-04-02 01:00:04.890173 [ERR] switch_core_session.c:1918 Invalid 
> Application
>
> If I take out the t38 lines, rxfax behaves as expected, receiving the 
> fax using ulaw.
>
> However, I would like to use t.38 instead, which is supported by my 
> gateway.
>
> My scenario is:
>
> PSTN -> CISCO AS5400 from my provider -> Internet -> My Freeswitch.
>
> I have also tried connecting a fax to a Grandstream HT-502, with the 
> same results. I get a INVITE (which don't mention anywhere T.38 in the 
> sdp) and Freeswitch never issues a reINVITE asking to switch to t.38
>
> My version of FS is:
> FreeSWITCH Version 1.0.head (git-24a9729 2011-03-11 13-00-55 -0600)
>
> Anybody can give me a clue on what could I be doing wrong????
>
> Thanks in advance!
>
> Alex
>
>
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