[Freeswitch-users] Fax hint request

[Ale]

Hi all,

I've compiled freeswitch from git, configured an external trunk and
added enabled-t38=true in fax.conf.
Both servers have a public ip. Tring to send a fax from cli via
origiante all t.38 fax fail with

2010-10-05 19:48:14.228734 [NOTICE] mod_sofia.c:880 Hangup
sofia/external/xxxxxx at ip [CS_EXECUTE] [RECOVERY_ON_TIMER_EXPIRE]
...
2010-10-05 19:48:14.228734 [DEBUG] mod_spandsp_fax.c:335 Fax
processing not successful - result (49) The call dropped prematurely.

Reading documentation i've found that RECOVERY_ON_TIMER_EXPIRE can be
caused by nat configuration problem, but i think configuration could
be reasonably  correct.

sip flow: http://i56.tinypic.com/30j1ezn.png
remote trying after the initial invite of fs: http://i52.tinypic.com/255hlps.png
remote 183 session in progress: http://i54.tinypic.com/293jew2.png

After 183 fs wait some time, probably a timeout, and send a cancel request.

On fs cli i see also the data below, but fs never send to remote trunk.
2010-10-05 19:48:04.235005 [DEBUG] sofia_glue.c:137
sofia/external/xxxx at ip image media sdp:
v=0
o=FreeSWITCH 1286300921 1286300923 IN IP4 213.187.9.30
s=FreeSWITCH
c=IN IP4 xxx.xxx.9.30
t=0 0
m=image 21562 udptl t38
a=T38FaxVersion:0
a=T38MaxBitRate:14400
a=T38FaxFillBitRemoval
a=T38FaxRateManagement:transferredTCF
a=T38FaxMaxBuffer:2000
a=T38FaxMaxDatagram:400
a=T38FaxUdpEC:t38UDPRedundancy

Can anyone give me a hint, if i'm wrong something?

Many thx,
Ale