•Trunk Queuing - directs the CBX to help you complete your call when you are trying to reach an outside number and all trunks (outside lines) in your company’s system are busy. Trunk Callback Queuing lets you hang up and have the CBX call you back when a trunk becomes free. After you answer, the CBX dials the number. Trunk Standby Queuing lets you stay on the line until a trunk becomes free. The CBX then dials the number. (See “Trunk Queuing” on page