Rescue Assistance System is an emergency intercom system that allows people who are unable to reach safety by themselves to summon assistance from rescue personnel.
It provides audio communication between area of rescue remote call stations (in protected stairwells) and the building lobby. Calls are indicated at the lobby master stations. The master station has sensitive 2-way communication to the remote call stations, and can also initiate call tones to them. Check local codes for additional requirements.