I am using ASTPP 5.0 and facing issue with DID incoming, Like if customer have zero or negative balance that time calls are landing. where customers are in prepaid plan. let me know how to stop that or where I missed to configure it.
Check your /var/lib/astpp/astpp.lua file and look for the INB_FREE option. It is TRUE by default but if you want to charge for inbounds you need to change it to FALSE.