A distributed topology exists when application servers are located within the supported sites.
This topology typically consists of one location that includes a dedicated application server and a dedicated storage server. Remote locations have a dedicated application server but no storage server.
The following image is an example of a topology with two sites, Atlanta and Boston. You can also create a distributed topology of more than two sites.
In this example, there are three application servers: two in Atlanta and one in Boston. Each application server communicates with its local telephony server. However, all the application servers communicate with the dedicated storage server that is located in Atlanta.