An intercom telephone is a special kind of

telephone A telephone is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be easily heard directly. A telephone converts sound, typically and most efficiently the human voice, into e ...

that controls an intercom system. Intercom telephones can be found in residential, commercial, and educational settings. For an example, a

school A school is an educational institution designed to provide learning spaces and learning environments for the teaching of students under the direction of teachers. Most countries have systems of formal education, which is sometimes compuls ...

is an environment that displays all the capabilities of an intercom telephone. Using an intercom telephone, administrators can make announcements over

loudspeakers A loudspeaker (commonly referred to as a speaker or speaker driver) is an Acoustical engineering#Electroacoustics, electroacoustic transducer that converts an electrical audio signal into a corresponding sound. A ''speaker system'', also often ...

that are heard by the entire building, but they can also call a specific

classroom A classroom or schoolroom is a learning space in which both children and adults learn. Classrooms are found in educational institutions of all kinds, ranging from preschools to universities, and may also be found in other places where education ...

's intercom by dialing the room number of that classroom. Intercom telephones can be interfaced with a building's

access control In the fields of physical security and information security, access control (AC) is the selective restriction of access to a place or other resource, while access management describes the process. The act of ''accessing'' may mean consuming ...

system.

References

Telecommunications equipment {{Telecommunications-stub

See also

References