asterisk users - Feb 2015 - Can not calculate far_max_ifp before far_max_datagram has been set

Hello,

I use Asterisk 13.1 with a SIP trunk with a provider

When transmitting or receiving a fax in T.38 through the trunk with the provider
I always get this warning:

WARNING [8204]: udptl.c: 852 calculate_far_max_ifp: UDPTL (no tag): Can not
calculate far_max_ifp before far_max_datagram has been set

After the warning begins exchanging packets UDPTL, but all with sequence number
0 or 256.
The fax is not properly transmitted or received.

I configured the trunk as follow:

t38_udptl = yes
t38_udptl_ec = redundancy
t38_udptl_maxdatagram = 400

How can I fix the problem?

Thank You
Marco
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.digium.com/pipermail/asterisk-users/attachments/20150204/2b939377/attachment.html>