A polite knock, from anyone, to anywhere.
Stick a QR code on the door. Visitors scan, tell you who they are and what they need, and your whole team hears it instantly.
Scan
Visitor scans your door's QR and fills a quick form.
Knock
Everyone on the door gets a live alert with a chime.
Answer
Whoever's free taps Answer. No more guessing at the door.