Security system for buildings with elevator installations

A method of operating a building security system comprising a building alarm system and an emergency communications system of an elevator installation, wherein the emergency communications system includes a communications interface to couple the emergency communications system to a remote elevator service central, and an emergency call panel arranged in an elevator car to allow a passenger to communicate with the remote elevator service central via the communications interface while in the elevator car during an emergency situation, and wherein the building alarm system includes a plurality of sensor units arranged at predetermined locations of the building and selected to detect predetermined building events, comprising:

• receiving, by the emergency communications system of the elevator installation, an event signal from the building alarm system, the event signal representing a predetermined value if a sensor unit detects a building event;
• establishing, by the emergency communications system, a communications link between the emergency communications system and the elevator service central;
• communicating an indication of the building event via the communications interface of the emergency communications system to the remote elevator service central;
• and
• communicating an action request from the remote elevator service central via the communications interface of the emergency communications system to the building alarm system.