This worked:

<action application="spandsp_start_fax_detect" data="transfer 'fax' 10 ced"/>

>From documentation:

Uses the spandsp code to detect fax tones which should be more reliable than using tone_detect. By default, the application detects CNG tones (sending side) tone_type can be set to "ced" to detect CED tones (receiving side).

https://wiki.freeswitch.org/wiki/Mod_spandsp#Controlling_the_app

On Tue, Jul 12, 2016 at 11:41 PM, Gonzalo Gasca Meza <gascagonzalo@gmail.com> wrote:

Hi all,

I'm configuring FS 1.7 to perform a dialout. If a fax is detected, I would like transfer call to an specific extension/application. I tried example in FreeSwitch cookbook, but doesn't seem to detect the FAX. http://pastebin.com/0F6M1DSe 

Topology:

Freeswitch --> SIP Provider -- PSTN ---> Fax machine

Only when I try from CLI invoking spandsp_start_fax_detect it works: 

originate {ignore_early_media='true',fax_enable_t38=true,fax_verbose=true,fax_use_ecm=false,fax_enable_t38_request=false}sofia/gateway/twilio/+18884732963 'spandsp_start_fax_detect:txfax /tmp/txfax-sample.tiff 10 ced,sleep:10000' inline

These are the logs using Freeswitch Cookbook sample:

http://pastebin.com/0F6M1DSe

I have tried the following combinations without success:

<action application="export" data="execute_on_fax_detect='execute_extension fax'"/>

<action application="spandsp_start_fax_detect" data="txfax '/tmp/txfax-sample.tiff 10 ced'"/>

<action application="spandsp_start_fax_detect" data="transfer 'fax XML default' 2"/>

<action application="spandsp_start_fax_detect" data="transfer '9179 XML default' 2"/>

This is my config http://pastebin.com/6Awmxk14

   <extension name="telephonist">

         <condition field="destination_number" expression="^handle_calls$">

                <action application="answer"/>

                <action application="log" data="INFO handle_calls application match"/>

                <action application="set" data="fax_verbose=true"/>

                <action application="set" data="transfer_ringback=${us-ring}"/>

                <action application="export" data="execute_on_fax_detect='execute_extension fax'"/>

                <action application="playback" data="silence_stream://20000"/>

                <action application="hangup"/>

         </condition>

   </extension>

   <extension name="fax_handler">

      <condition field="destination_number" expression="^fax$">

        <action application="log" data="INFO FAX detected"/>

        <action application="txfax" data="/tmp/txfax-sample.tiff 10 ced"/>

        <action application="log" data="INFO FAX completed"/>

        <action application="hangup"/>

      </condition>

    </extension>

    <extension name="fax_receive">

      <condition field="destination_number" expression="^9178$">

        <action application="answer" />

        <action application="playback" data="silence_stream://2000"/>

        <action application="rxfax" data="$${temp_dir}/rxfax.tif"/>

        <action application="hangup"/>

      </condition>

    </extension>

    <extension name="fax_transmit">

      <condition field="destination_number" expression="^9179$">

        <action application="txfax" data="$${temp_dir}/txfax-sample.tiff"/>

        <action application="hangup"/>

      </condition>

    </extension>

Thanks

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