If your facility has no need for voice communication, the Vista Series by ?Intercall Systems is the right choice. This visual nurse call system is simple yet effective, a? visual/tone based system that can support up to 150 calls. When a patient in need of assistance presses the nurse call button the staff will be alerted with a light and tone at the nurse’s station staff. Corridor lights, usually placed outside each room, lights up to indicate a patient call. Annunciator panels are available in a number of? versions, allowing for a fully customizable system.