What is an Intercom?

In its classic sense, an intercom is an electronic communication device that allows for one-way or two-way audio conversations between fixed points within a specific, localized area. However, in the context of modern telecommunications, the term "intercom" can describe two distinct functions.

1. The Intercom System

This refers to a dedicated system designed for communication between two specific endpoints. The most common business application is a door entry system, which allows a visitor at an entrance to speak with someone inside the building, such as a receptionist. These systems are also frequently used at security gates, parking barriers, or within different areas of a large facility.

With the advent of IP and cloud technology, modern intercom systems have evolved significantly:

• Video Integration: IP video intercoms are now standard for door entry, allowing staff to not only speak with but also visually verify a visitor before granting access, greatly enhancing security.
• Remote Access: Because these systems operate over the internet, the two endpoints no longer need to be on the same physical network. A visitor at the front door can be answered by a remote worker on their computer or mobile device.

2. The Phone Intercom Feature

This describes a function available on many VoIP phone systems that allows a user to make a one-way, broadcast-style announcement directly to another user's phone or a group of phones.

When this feature is used, the call automatically bypasses the ringing step and activates the recipient's phone loudspeaker, allowing the message to be heard instantly. This is often used for quick announcements or to get an immediate message to a colleague without requiring them to pick up their handset. This function is also commonly referred to as Paging.