Status polls are the key element in multisite BSR applications. Status polls provide the communication link between Communication Manager that interflows a call and other Communication Manager that provides service to the call.

The vectors that you write in multisite applications must balance the costs of time and trunk usage with the benefit of better customer service. BSR is designed to help you achieve this balance, incorporating mechanisms to maximize improvements in customer service while minimizing interswitch communications with attendant delays and trunk usage. This section explains the mechanisms and the benefits.