Building intercom systems are essential communication tools that facilitate seamless interaction and coordination within residential, commercial, and institutional settings. These systems enable instant voice communication between different areas or units within a building, enhancing security, convenience, and efficiency. Typically consisting of master stations, substations, and door release mechanisms, building intercoms allow occupants to screen visitors, grant access remotely, and communicate with individuals at entry points. Advanced features such as video intercoms provide visual verification, enhancing security and enabling face-to-face communication. Whether used for visitor management, emergency response coordination, or everyday communication, building intercom systems play a vital role in fostering connectivity and safety within built environments.