[Freeswitch-users] t38_gateway self - no re-Invite?

Helmut Kuper helmut.kuper at ewetel.de
Tue Feb 22 12:28:32 MSK 2011

Hash: SHA1

Hello Clemens,

I'm using t38 a few month now. And I have had also big problems to get
FS and mod_spandsp as a t38-Gateway up and running. The only way I found
to get it work in most cases was to change the code in mod_spandsp.c

I changed line 99 from
switch_ivr_tone_detect_session(session, "t38", "1100", "rw", timeout, 1,
data, NULL, t38_gateway_start)

switch_ivr_tone_detect_session(session, "t38", "2100", "rw", timeout, 1,
data, NULL, t38_gateway_start)

The recompile mod_spandsp and reload it into FS.

This could affected the inbound way. So you have to play with the
frequency to detect. Maybe you have to listen to both 1100Hz and 2100Hz.

t38 is not really easy with mod_spandsp.

Am 22.02.2011 02:50, schrieb Clemens Ebentheuer:
> Hi to all from austria,
> I´m very new to freeswitch and I´m trying to get t38_gateway self working - but no success.
> for testing I use zoiper or spa2102 as t38 "device" - i have troubles in outbound direction:
> t38 device(internal) -> FS:t38_gateway self -> sip-provider (external - no t38 support)
> freeswitch sends no re-invite, I guess
> and Zoiper BYEs with Reason: SIP;description="Stale re-Invite"
> also see:
> http://pastebin.freeswitch.org/15439
> inbound (t38_gateway peer) works fine - also when I do 
> t38 device -> FS:rxfax
> my simple dialplan for the outbound call:
> <extension name="scpa" >
>    <condition field="destination_number" expression="^1(.*)$">
>        <action application="set" data="fax_enable_t38_request=true"/>
>        <action application="set" data="fax_enable_t38=true"/>
>        <action application="set" data="execute_on_answer=t38_gateway self"/>
>        <action application="bridge" data="sofia/gateway/scpa567/$1"/>
>    </condition>
> </extension>
> Maybe I have to mention that I´m using Fusionpbx?!
> Thanks for any advice! I allready tried different examples I found, but no luck...
> Clemens
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