Trunk from FreePBX 17 to ASTPP using IP authentication

Can anybody advise me regarding configuring a trunk from FreePBX 17 to ASTPP using IP authentication, as my trunk doesn’t seem to be working no matter what I try. In my setup I am using FreePBX 17 to register extensions etc and ASTPP to handle billing of outgoing calls.

seem like you have to add a trusted peer ip to your FreePBX

I did do that.