Much social interaction goes on at a door's threshold: you poke your head in for a quick chat with a colleague, or you pass through to enter a meeting or to follow up a previous conversation. Sensors and a voice recognition system outside and inside the digitally enhanced threshold indicate a person's approach and identity. This "smart" threshold can also be used to help manage meeting size or meeting scheduling. It does so by using electronically enhanced doormats that would know and communicate how many people enter or leave a room. Voice interface can identify visitors and reschedule them if the room's occupant is not there. A graphical interface in the room can let the room's owner approve the entrance of a visitor.