[asterisk-users] T.38 SIP Issues

[Mindaugas Kezys]

Hello,

This can help: http://80.86.84.71/kolmiwiki/index.php/Send_Receive_Fax-T38

Regards,
Mindaugas Kezys
http://www.kolmisoft.com
MOR PRO - Advanced Billing for Asterisk PBX


-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Andreas van
dem Helge
Sent: Thursday, March 13, 2008 5:16 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: [asterisk-users] T.38 SIP Issues

Is there any trick to getting T.38 fax to work with SIP? I had it
working and one day with no changes *poof* it stopped working and
hasn't worked for months. The only common factor is Asterisk 1.4.x
(always try to use the latest version) and NAT.

I've tried:

-Linksys ATA
-Grandstream ATA
-Audicodes ATA

All do the same thing. Call connects, hear the first 2sec of fax tone
and then just silence, but the call usually stays open.

I've tried two T.38-capable providers.

I've tried two different routers:
-Linksys WRT54GS running DD-WRT (Linux)
-Dell Optiplex 170L running PFSense (BSD)

Different Linux distros on the servers:
-SuSE 64bit
-RHEL 32bit
-SuSE 32bit

Is there any magic to get this to work? As far as I can tell the only
possible config option is "t38pt_udptl = yes" which I have set under
[general] & the peer.

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