Once a call is established using circuit switching, what occurs during the duration of the call?

In circuit switching, once a call is established, a dedicated communication path or circuit is allocated for the entire duration of that call. This means that the resources required to maintain the call, such as bandwidth and circuit connections, remain exclusively assigned to that specific call without interruption. The dedicated nature of this circuit ensures stable and consistent communication, as the potential for variations in signal quality or delays—common in other methods of transmission such as packet switching—is minimized.

While other options might suggest shared or random access to circuits or periodic refreshing, these are not characteristics of circuit-switched networks. Instead, the hallmark feature is that the circuit remains open and reserved solely for the established call for the entire duration, providing an uninterrupted service. This commitment of resources is essential for voice calls, where continuous and real-time communication is crucial.