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In this framework, the service provider runs its IT infrastructure and gives the customer access to a service in the " cloud. " This service not only contains the functionality of a traditional PBX, but it also builds on top of it and expands it greatly. Companies with dated PBX systems can migrate to cloud PBX services with minimum costs compared to the investment required for upgrading the old PBX hardware. With the new hosted PBX model, end-users benefit from greater flexibility, a more efficient control over costs, and only pay for the resources they use. The service provider is in charge with the upgrade, the maintenance, and the security of the IT systems. As an added benefit, users no longer need to waste IT resources on maintenance.
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