What device is used for voice communications from one point to another within an aircraft?

The intercom is specifically designed for voice communications within an aircraft, allowing crew members and passengers to communicate effectively without needing external radio frequencies. It operates on an internal network, often utilizing a system of wires and speakers, which facilitates clear and immediate communication among crew members in various parts of the aircraft.

Unlike a receiver or transmitter, which are components of radios used for sending or receiving signals over distances, the intercom is tailored explicitly for intra-cabin communication. An antenna, on the other hand, is utilized for transmitting or receiving radio signals but does not handle voice communications directly. Thus, the intercom is the appropriate choice for enabling clear voice communication from one point to another within the aircraft.