Final answer:
The type of tele-service occurring when a customer calls a catalog order line to place an order is an inbound call, as the customer initiates the contact with the company.
Step-by-step explanation:
When a customer calls a catalog order line to place an order, the type of tele-services taking place is an inbound call. Inbound calls occur when a customer initiates the call to the company to inquire about services or products, or to make a purchase. This is in contrast to an outbound call, where the company initiates the call to the customer, often for sales or marketing purposes. A solicitation call is a specific type of outbound call where the goal is to solicit the customer to buy something or take part in a survey. Thus, a customer calling to place a catalog order is best described as making an inbound call.