Entryphone

a type of phone placed on a wall outside that allows people to talk to people who are inside or in in different parts of an apartment, house, or room before going inside

An Entryphone, also known as an intercom system, is a communication device used to speak with someone at the entrance of a building before allowing them entry. It typically includes a speaker, microphone, and sometimes a video screen, enabling the person inside to verify who is at the door. Entryphones are commonly used in apartment buildings, office complexes, or gated properties to control access and enhance security.