A Deep Dive into Door Phone Intercom Systems

door phone intercom

Door Phone Intercom systems stand out as a fundamental component for both residential and commercial properties in the ever-evolving landscape of security technology. These systems have transformed the way we control access to buildings, offering a seamless blend of communication and security features. In this article, we define what a door phone intercom is, its components, and how it works.

What is a door phone intercom?

A door phone intercom is a door entry system that allows residents to control property access using a telephone device installed in their apartment units. It  provides communication between visitors and residents in order to verify the visitor’s identity before remotely allowing them entry into the building.

A door intercom system will normally comprise of a two-way communication system using audio-only or audio & video between parties. This will form part of the building’s access control infrastructure to control entry and exit through doors, gates, car park barriers, etc

Components of door phone intercom systems

Outdoor Panel: Positioned near the entrance, the outdoor panel serves as the interface for visitors. It usually features a call button or keypad, and in more advanced systems, a camera for video communication. When a visitor presses the call button, it initiates a call to the indoor station.

outdoor station

Indoor Station: Installed inside the building, the indoor station allows occupants to communicate with visitors and remotely control access. It comprises a speaker, microphone, and sometimes a video display for visual identification. Occupants can speak to visitors, view them via video feed (if available), and unlock the door if necessary.

indoor station

Door release: Door releases are the mechanisms that unlock your electric and magnetic lock. You’ll need to install a door release mechanism that will remotely unlock the front door or gate when residents grant access to a visitor.

How Does a Door Phone Intercom Work?

A door intercom, or door buzzer, works as a two way communication system that connects your building to the outside world.

A buzzer is connected to your building. When someone wants to gain access to your building, they will need to ring the buzzer, which is connected to the phone system in the building. The phones will ring to alert that someone is at the door. Once the phone has been answered and you have established who is wanting to gain access to your building, you can press a button which is connected to the door of your building. Once this button is pressed, the door opens and the visitor can enter the building.

Advantages of Door Phone Intercom Systems


One of the main reasons people install intercom systems is for convenience. With an intercom, you can easily communicate with people in other parts of your house without having to walk over there or yell from a distance.

Enhanced Security

Door phone intercom systems provide an added layer of security by allowing occupants to verify the identity of visitors before granting access. This helps prevent unauthorized entry and enhances overall building security.

No More Yelling

One of the more obvious benefits of having an intercom system is that you no longer have to shout when talking to other people in your home. 

Remote Access Control

Occupants can remotely control access to the building, allowing them to unlock the door for expected guests or delivery personnel without needing to be physically present at the entrance.

Limitations of door phone intercoms

Limited range

Range of an intercom system is also often limited, which can be a problem if you have a large house. This means that you may not be able to communicate with people who are far away from you, which can be a problem if someone needs assistance.

Excessive wiring

Running wires throughout your property to connect each in-unit doorphone to the entryway device is cumbersome and costly. Not to mention, you’ll need to anticipate issues with wiring and budget for repair expenses.

Excessive hardware

Door phone intercoms require an in-unit device installed in every unit. For multifamily properties with hundreds of units, the cost of hardware and installation will add up quickly. Because of this, you have to factor in the expense of installing every in-unit device.

Residents must be in their units to answer visitors’ calls

Because the system isn’t cloud-based, residents must be in their units to grant access to visitors. Residents will have to be home to press the ‘door open’ button on their in-unit devices. Otherwise, guests will need a copy of the resident’s key to get into the building. Or, they will have to speak directly with property staff to gain access. This is disruptive and inconvenient to everyone involved.


Door phone intercom systems play a vital role in modern building security and access control. However, there are both pros and cons to installing an intercom system in your home. Before making a decision, it’s important to consider which benefits and drawbacks are most important to you. If you decide that an intercom system is right for you, be sure to research the different options available to find the best system for your needs.

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