[Freeswitch-users] Fax transmission success rate fall from 86% to 3% after upgrade from 1.2 to HEAD

[Mateusz Bartczak]

Hi All

I have several problem after upgrading legacy system based on FreeSWITCH
1.2x to latest HEAD

With no configuration changes and on the same hardware fax transmission
success rate fall from 86% to 3%

Most calls end up with SpanDSP status/error code 41

Dialplan part I'm using is:

<extension name="infax_t38">
    <condition field="destination_number" expression="^fax_(.*)$"/>
        <condition field="${acl(${network_addr} inbound_acl)}"
expression="true">
        <action application="export"
data="nolocal:absolute_codec_string=PCMA,PCMU"/>
        <action application="set" data="api_hangup_hook=lua
/usr/local/FreeswitchFax/rxfax_db.lua ${destination_number} ${uuid}"/>
        <action application="set"
data="fax_ident=${destination_number:4:20}"/>
        <action application="set" data="fax_header=VirtualFAX"/>
        <action application="answer"/>
        <action application="playback" data="silence_stream://2000"/>
        <action application="set" data="fax_enable_t38=true"/>
        <action application="set" data="fax_use_ecm=true"/>
        <action application="set" data="fax_enable_t38_request=true"/>
        <action application="rxfax"
data="/usr/local/freeswitch/var/rxfax/rxfax.${destination_number:4:20}.${uuid}.tiff"/>
        <action application="hangup"/>
    </condition>
</extension>

Any hints on what could cause such dramatic success rate?
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