There are three options for the ring strategy:

ROUND ROBIN

This will ring available queue members one at a time based on the order they appear in the queue and go through that sequence until the call is answered. 

THE LEAST USED (RECENT) 

This will ring the available queue member that has been offered a call least recently until they answer that call. If another call comes in, it will go to the next available queue member who has been provided a call the least recently.

RING ALL

This will ring all available queue members simultaneously until the call is answered.