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 : 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