Select Overflow Queue
Use the Select an overflow queue dialog box to select a queue where calls are forwarded when a response group queue is full.
In the search box, type all or part of the name of the queue you want to use. To return all available queues, leave the search box empty and click the search icon.
In the list of queues returned by the search, select the queue you want to use to forward calls when a response group queue is full.