<div dir="ltr">Hi All<div><br></div><div>I have several problem after upgrading legacy system based on FreeSWITCH 1.2x to latest HEAD</div><div><br></div><div>With no configuration changes and on the same hardware fax transmission success rate fall from 86% to 3%</div><div><br></div><div>Most calls end up with SpanDSP status/error code 41</div><div><br></div><div>Dialplan part I&#39;m using is:</div><div><br></div><div><div>&lt;extension name=&quot;infax_t38&quot;&gt;</div><div>    &lt;condition field=&quot;destination_number&quot; expression=&quot;^fax_(.*)$&quot;/&gt;</div><div>        &lt;condition field=&quot;${acl(${network_addr} inbound_acl)}&quot; expression=&quot;true&quot;&gt;</div><div>        &lt;action application=&quot;export&quot; data=&quot;nolocal:absolute_codec_string=PCMA,PCMU&quot;/&gt;</div><div>        &lt;action application=&quot;set&quot; data=&quot;api_hangup_hook=lua /usr/local/FreeswitchFax/rxfax_db.lua ${destination_number} ${uuid}&quot;/&gt;</div><div>        &lt;action application=&quot;set&quot; data=&quot;fax_ident=${destination_number:4:20}&quot;/&gt;</div><div>        &lt;action application=&quot;set&quot; data=&quot;fax_header=VirtualFAX&quot;/&gt;</div><div>        &lt;action application=&quot;answer&quot;/&gt;</div><div>        &lt;action application=&quot;playback&quot; data=&quot;silence_stream://2000&quot;/&gt;</div><div>        &lt;action application=&quot;set&quot; data=&quot;fax_enable_t38=true&quot;/&gt;</div><div>        &lt;action application=&quot;set&quot; data=&quot;fax_use_ecm=true&quot;/&gt;</div><div>        &lt;action application=&quot;set&quot; data=&quot;fax_enable_t38_request=true&quot;/&gt;</div><div>        &lt;action application=&quot;rxfax&quot; data=&quot;/usr/local/freeswitch/var/rxfax/rxfax.${destination_number:4:20}.${uuid}.tiff&quot;/&gt;</div><div>        &lt;action application=&quot;hangup&quot;/&gt;</div><div>    &lt;/condition&gt;</div><div>&lt;/extension&gt;</div></div><div><br></div><div>Any hints on what could cause such dramatic success rate?</div></div>