<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">Hello,</div><div class=""><br class=""></div><div class="">I use Asterisk 13.1 with a SIP trunk with a provider</div><div class=""><br class=""></div><div class="">When transmitting or receiving a fax in T.38 through the trunk with the provider I always get this warning:</div><div class=""><br class=""></div><div class=""><b class="">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</b></div><div class=""><br class=""></div><div class="">After the warning begins exchanging packets UDPTL, but all with sequence number 0 or 256.</div><div class="">The fax is not properly transmitted or received.</div><div class=""><br class=""></div><div class="">I configured the trunk as follow:</div><div class=""><br class=""></div><div class=""><b class="">t38_udptl = yes</b></div><div class=""><b class="">t38_udptl_ec = redundancy</b></div><div class=""><b class="">t38_udptl_maxdatagram = 400</b></div><div class=""><br class=""></div><div class="">How can I fix the problem?</div><div class=""><br class=""></div><div class="">Thank You</div><div class="">Marco</div></body></html>