Pocket Paging in a Hospital
From Zenitel Wiki
In a Hospital there is often not enough to page a person where only the initiator number is shown in the receiver display. A significant difference in tone characteristics, priority and text it is often a demand. This applies especially to alarms and calls for key, critical personnel teams like doctors, x-ray, anesthesia and nurses during heart failures and other complications. But it is also useful for call requests from doors, elevators and technical alarms to other key personnel.