Multisite applications can be structured in a variety of ways. In general, however, most applications fit one of two models: distributed or centralized. When each switch in a network interflow calls to other switches and receive interflows, this is called a distributed system. A centralized system, by contrast, is one in which all calls are initially delivered to a single call center, the hub, and distributed from this site to queues at remote switches. A centralized system requires greater inter-switch trunking, since a greater percentage of calls must be redirected. However, if your organization has a significant investment in VRU and CTI technology at the hub, the configuration is appropriate.
