I think you can find your setup, from where re-invite comes from here:
https://wiki.freeswitch.org/wiki/Mod_spandsp#t38_gateway

and then just apply the recommended settings

On Sat, Sep 24, 2016 at 3:40 PM, Andre DeMattia <andretodd@verizon.net> wrote:

Hello can someone tell me if these values below work in bypass media mode?

I read the wiki but I’m not sure 100% if these settings will reject t38. Do I need all 3 to reject a T.38?

 

 

<action application="set" data=" refuse_t38=true"/>

 

<action application="set" data="fax_enable_t38=false"/>

<action application="set" data="fax_enable_t38_request=false"/>

 


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