What is the procedure when somebody want to make call in my shop?
a. Ask your customer how much he would like to pay, for example 5USD b. Access your account management, make one calling card with 5USD initial amount, collect 5USD from the customer. c. Customer go to make call (computer or ip phone), after he finish, you check with him his balance. d. Customer take card to home and call next time (any time), or he will request a balance refund.