• Room calls: Normal call, emergency call, diagnostic call, doctor call
• Cancellation and presence: Combined cancellation/presence, Presence 1 (green)
• Acoustic signals: Call transfer for normal call and emergency call, doctor call, staff call, meal call
• Control of optical signals: WC call lamp (white), room call lamp (red), AW (cancellation and presence) lamps (green and yellow)
• Security function: Short-circuit resilient, call circuit monitoring