Outbound fax failing

Good day,

i’m using FreePBX 10.13.66-17, with asterisk 13.13.1
I have the Fax Configuration Professional (13.0.36) and Fax Configuration (13.0.40) installed

When, from the UCP, I try to send a fax, I get those error as the result:
-The call dropped prematurely
-No response after sending a page

I tried incoming too (fax to email)… doesnt work…

Any idea where to look?