Hosted call centers have an advantage over self-built call centers not only in terms of purchase cost, but most importantly in terms of total cost of ownership.
The hosted call center eliminates the cost of purchasing hardware and software for the self-built call center, the daily maintenance cost, the monthly fee for the telecommunication relay, and the maintenance cost of the system integrator in the future. So the cost is very low in the whole process of using the call center.
The hardware needed for a self-built call center are switches, industrial controllers, voice cards, servers, and software such as cti middleware, database software, crm business systems, acd queuing systems, recording systems, and so on.