Inbound Numbers Billing Process

When we offer Inbound Services like Tollfree or shared cost numbers, what is the best way to set up so billing is correct? Currently, it shows a loss in profitability chart because the customer is the vendor with a high termination rate and the vendor is the customer with a low origination rate, how can we set up this use case using Yeti?

@dmitry.s any best practice for this use case type?