Building Intercom System: The Fundamental Communication Hub for Smart Communities and Intelligent Buildings

In today's rapidly developing smart communities and intelligent

buildings, the building intercom system has evolved from its 

initial function as a "door-opening intercom tool" into a crucial

infrastructure integrating communication, security, and 

management. It not only affects residents' daily convenience

but also directly impacts the overall security and intelligence

level of a building.

I. What is a Building Intercom System?

A building intercom system, also known as a building intercom

system (BIS), is an electronic communication system widely

used in residential communities, office buildings, hotels, 

schools, hospitals, and other locations.

The system integrates functions such as calling, two-way

intercom, video viewing, remote unlocking, and management

linkage, making it an indispensable component of modern

intelligent buildings.

II. The Development History of Building Intercom Systems

1️⃣ Initial Stage: Analog Non-Visual Intercom

Early building intercom systems primarily used analog audio

technology, only enabling simple calling, talking, and unlocking

functions, with limited functionality and scalability.

2️⃣ Development Stage: Bus-based Non-Visual System

With the expansion of building scale, bus-based parallel 

architecture has become widespread, enabling 

multi-building networking.

The property management center can communicate with 

resident extensions and door stations via the management

unit or remotely unlock doors, significantly improving

management efficiency.

3️⃣ Intelligent Stage: IP Network Video Intercom

Current mainstream building video intercom systems have

fully entered the era of IP-based, networked, and intelligent

systems.

The system can be deeply integrated with mobile apps, 

tablets, computers, smart homes, and security systems, 

enabling video calls, remote management, and intelligent

linkage anytime, anywhere.

III. Composition of a Building Video Intercom System

A complete building video intercom system typically 

consists of the following parts:

Management Center: Responsible for unified system 

management, including user information, equipment 

status, alarm handling, and remote monitoring.

Building Intercom Main Unit (Door Station): Installed 

at the building entrance/exit, enabling visitor calls, 

video calls, and access control.

Indoor Unit: Installed inside residents' homes, enabling 

video intercom, remote unlocking, and doorway monitoring.

Outdoor Unit (Optional): Used for multiple entrances 

or special scenarios, enhancing system flexibility 

and coverage.

IV. Core Functions of Building Video Intercom:

Two-way Video Intercom + Remote Unlocking:

Residents and visitors can talk in real-time, and 

unlock doors remotely after identifying the visitor.

Management Center Call and Response: Residents 

can call property management with one click, and 

property management can also proactively contact 

any resident.

Call Privacy Mechanism: Third parties cannot eavesdrop

on calls between any two parties, ensuring privacy

and security.

Indoor Unit Image Monitoring Function: Even without a call,

residents can proactively view real-time doorway footage.

Multi-Door Unit Parallel Operation: Supports unified 

management of multiple entrances, suitable for large 

residential communities or commercial complexes.

Management Center Video Monitoring and Remote 

Unlocking: Improves property security response speed 

and management efficiency.

V. Typical Application Scenarios of Building Video Intercom:

Residential Communities: Enhances overall community

security, optimizes visitor management, and improves the

living experience.

Office Buildings

Strengthen access control to cultivate a professional and

secure corporate image.

Hotels

Enable visitor reception and service calls, improving 

customer satisfaction.

Schools

Strictly control campus entrances and exits to ensure the

safety of teachers and students.

Hospitals

Support emergency calls and high-definition video intercoms

between patients, nurses, and doctors, improving emergency

response efficiency.

VI. Advantages and Disadvantages of Building Video Intercoms

✅ Advantages

1. Simple wiring and convenient installation

Based on TCP/IP networks, a single network cable can 

complete voice, video, and data transmission, significantly

reducing construction difficulty.

2. Strong networking capabilities and high scalability

Easy to integrate with access control, security, broadcasting,

and smart home systems, becoming the communication 

core of the "digital home."

3. Long transmission distance and low overall cost

No distance limitations, convenient maintenance, and a 

more cost-effective overall investment.

4. Rich functions and high security

Supports video recording and storage, cloud playback,

one-click alarm, and other functions for faster emergency

response.

5. Improved Management Efficiency and Convenience

Supports remote operation and maintenance, and online 

management, reducing labor costs.

⚠️ Disadvantages

1. High Technical and Installation Requirements

It is recommended that professional personnel plan, 

install, and debug the system to ensure stable operation.

2. Dependence on Network Environment

System functionality may be limited in the event of network 

anomalies or power outages, requiring backup solutions.

VII. Future Development Trends of Building Video Intercom

Accelerated Cross-Industry Integration

Deep integration with smart home, security, and IoT systems

to achieve truly smart buildings.

Integration of More Sensing Technologies

Such as temperature, humidity, and air quality monitoring, 

expanding the dimensions of building management.

Deep Application of Artificial Intelligence

Facial recognition, voice recognition, and intelligent analysis 

make building video intercoms "smarter."