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[marco.capetta at techl...]

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