The service has an automatic failover capability which re-routes inbound calls whenever a network outage or congestion is detected which prohibits the normal delivery of calls.
During normal operation the service attempts to deliver each call to the your voice network through a defined primary divert.
If a problem is experienced the service will automatically try to deliver that same call onto the your network through a secondary divert. Each and every call will be handled in the same way until the problem is cleared.
Typically, the secondary divert will utilise a second Digital Local Exchange (DLE). There is no geographic (national or international) restriction as to the location of this DLE relative to the customer premises or primary DLE.