Warteschleife(A holding area where callers are held until an agent becomes available. Each queue is associated with 0, 1, or more addresses (phone number or SIP URI), which may or may not be public For example, an overflow queue may not have an address, whereas other queues may have multiple addresses for different geographic zones); Warteschlange(A holding container for work items. Members of a queue must be of the same work item class (for example, only incidents))