[asterisk-users] Fax, T38 and NAT

[Magnus Benngård]

Gentlemen,

I have 3 faxes attached to an Asterisk. Fax - SPA2102 - Asterisk.

0851711201 and 0851711290 is on our WAN, no NAT.
0197673581 is outside our WAN and needs to be NAT'ed.

Sending a fax from 0851711201 to 0851711290, no problem, switches to T38
and fax goes through.
Sending a from 0197673581 to 0851711201, no problem as long as i dont
enable T38 on 0197673581.

But, if i enable T38 on 0197673581, changing t38pt_udptl=no to
t38pt_udptl=yes,fec and try to send from 0197673581 to 0851711201, it is
not working, switches to T38 sendimg a lot of UDPTL packages but it looks
like (at least for me) that addresses are "wrong".

 UDPTL (SIP/0197673581): packet from 90.230.92.67:33408 (type 0, seq 0,
len 6)
 UDPTL (SIP/0851711201): packet from 10.242.20.149:16434 (type 0, seq 0,
len 6)
 UDPTL (SIP/0197673581): packet from 90.230.92.67:33408 (type 0, seq 0,
len 6)
 UDPTL (SIP/0851711201): packet from 10.242.20.149:16434 (type 0, seq 0,
len 6)

90.230.92.67 is WAN ip of 0197673581's
router.
10.242.20.149 is ip of 0851711201's ATA (SPA2102).

Shouldn't the UDPTL stream go through Asterisk?
Have i missed sometheng else?

Asterisk SVN-trunk-r247652M built by root @ sip on a i686 running Linux on
2010-01-25 11:10:15 UTC

[0197673581]
secret=xyz
callerid=Input Interior Orebro (fax) 
disallow=all
allow=alaw:40
allowoverlap=yes
allowsubscribe=yes
callcounter=yes
callingpres=allowed_passed_screen
canreinvite=no
context=inputinterior.se
directmedia=no
dtmfmode=rfc2833
faxdetect=no
host=dynamic
language=se
nat=yes
qualify=yes
sendrpid=pai
t38pt_udptl=no
transport=udp
trustrpid=yes
type=friend
videosupport=no

[0851711201]
secret=xyz
callerid=Input Interior Stockholm (fax)

disallow=all
allow=alaw:40
allowoverlap=yes
allowsubscribe=yes
callcounter=yes
callingpres=allowed_passed_screen
canreinvite=yes
context=inputinterior.se
directmedia=yes
dtmfmode=rfc2833
faxdetect=no
host=dynamic
language=se
nat=no
qualify=yes
sendrpid=pai
t38pt_udptl=yes,fec
transport=udp
trustrpid=yes
type=friend
videosupport=no

[0851711290]
secret=xyz
callerid=Input Interior Sundbyberg (fax) 
...
rest is the same as [0851711201] 

Regards, 

Magnus
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