Intercom and Door Station Systems: Modern Entry Solutions

Intercom systems have undergone a dramatic transformation over the past decade. Legacy analogue intercoms used dedicated two-wire or four-wire cabling to connect a door station to an indoor monitor, with each apartment or office requiring its own cable run back to the entry panel. These systems were expensive to cable, difficult to expand, and offered limited functionality — typically just audio communication and a door release relay. Modern IP intercoms run over standard Ethernet cabling and leverage the existing network infrastructure, dramatically reducing installation costs and enabling features that were impossible with analogue technology.

The shift to IP has also changed the competitive landscape. Where the intercom market was once dominated by specialist manufacturers like Aiphone and Comelit, surveillance giants Dahua and Hikvision now offer comprehensive intercom product lines that integrate natively with their camera and access control ecosystems. Meanwhile, dedicated IP intercom vendors like 2N (owned by Axis Communications) and Akuvox have carved out strong positions by focusing on SIP interoperability and enterprise integration. For Australian IT resellers, the intercom market represents a natural extension of existing surveillance and networking practices, with healthy margins and recurring revenue opportunities through cloud-based management services.

The most significant capability of modern IP intercoms is SIP (Session Initiation Protocol) support. SIP is the same protocol used by VoIP phone systems, meaning an IP intercom can register as an extension on a PBX just like a desk phone. When a visitor presses the call button on a door station, the call rings through to a designated extension, a ring group, an auto-attendant, or even a mobile softphone via the PBX. This integration means businesses do not need a separate intercom monitor at reception — the receptionist answers door calls on their existing desk phone or headset, views the visitor on their PC via a video stream, and triggers the door release without leaving their seat.

SIP intercoms from 2N and Akuvox support standard SIP, making them compatible with virtually any SIP-based PBX including 3CX, Yealink, Asterisk, FreePBX, Cisco CUCM, and cloud platforms like Microsoft Teams (via SIP gateway). Dahua and Hikvision intercoms also support SIP but tend to work best within their own ecosystems. When integrating with Microsoft Teams, the intercom registers via a Teams SIP Gateway or a third-party SBC (Session Border Controller), allowing door calls to ring directly to a Teams user or channel. This is increasingly popular in modern offices where Teams has replaced the traditional phone system.

Modern video door stations combine a camera, microphone, speaker, call buttons, and often a card reader or keypad into a single unit. Camera specifications vary widely — entry-level models offer 1MP resolution with a narrow field of view, while premium units like the 2N IP Verso and Akuvox X915 feature 2MP wide-angle cameras with IR illumination for night visibility. Some models include dual cameras — one wide-angle for scene overview and one narrow-angle for facial capture. Look for units with WDR (Wide Dynamic Range) to handle challenging lighting conditions such as direct sunlight behind visitors or dark entry lobbies with bright exterior light.

Audio quality is often overlooked but critically important for intercoms. Full-duplex audio allows both parties to speak and listen simultaneously, just like a phone call. Half-duplex systems require push-to-talk or use voice activity detection to switch between send and receive, which creates an awkward user experience. Noise cancellation and echo suppression are essential for outdoor installations where wind and traffic noise can overwhelm the microphone. Premium intercoms also feature adjustable speaker volume with automatic ambient noise compensation, raising the volume in noisy environments and lowering it in quiet ones.

Nearly all modern IP intercoms support Power over Ethernet (PoE), typically requiring IEEE 802.3af (15.4W) or 802.3at (30W) for models with heated enclosures or high-power IR illuminators. PoE simplifies installation enormously — a single Cat6 cable provides both data connectivity and power, eliminating the need for a local power supply at the door station. For retrofit installations in existing buildings, this is a significant advantage over legacy analogue intercoms that required separate power and communication cabling.

Physical installation considerations include weather resistance (look for IP65 or IP67 ratings for outdoor units), vandal resistance (IK08 or IK10 ratings for high-risk locations), and mounting options (flush-mount for clean aesthetics or surface-mount for easier installation). In Australian conditions, consider heat tolerance — intercom panels in direct afternoon sun can reach extreme temperatures, and not all units are rated for the 50°C+ surface temperatures common in summer. Vandal-resistant models with stainless steel faceplates and tamper-proof screws are recommended for public-facing installations such as apartment building lobbies and commercial building entries.

Multi-tenant buildings — apartment complexes, office towers, and mixed-use developments — present unique intercom challenges. The entry panel must allow visitors to locate and call the correct tenant from a potentially large directory. Modern multi-tenant panels use touchscreen displays with searchable directories, scrollable tenant lists, and direct-dial buttons for frequently contacted tenants like building management. The 2N IP Verso uses a modular design where button, keypad, card reader, and display modules click together to build a customised panel. The Akuvox X916 offers a large touchscreen with facial recognition for hands-free entry by registered residents.

In multi-tenant deployments, each unit typically has an indoor monitor or uses a mobile app as the answering station. Indoor monitors range from basic 4.3-inch screens to 10-inch Android-based tablets that double as smart home controllers. Mobile app answering is increasingly popular because it allows tenants to see and speak to visitors from anywhere, not just when they are home. This requires a cloud relay service — vendors like 2N (My2N), Akuvox (SmartPlus), and Dahua (DMSS) all offer cloud platforms that route calls to mobile apps when the tenant is away. For resellers, these cloud services often carry monthly per-unit fees, creating a recurring revenue stream.

A well-designed entry solution integrates the intercom with the building's access control and surveillance systems. When a visitor presses the call button, the intercom triggers a snapshot or video clip that is stored in the VMS alongside access control event logs, creating a visual audit trail of every visitor interaction. Door release events from the intercom are logged in the access control system, showing exactly who authorised entry and when. Dahua and Hikvision intercoms integrate natively with their respective access control and VMS platforms, while 2N and Akuvox integrate via APIs, ONVIF, and standard Wiegand/OSDP outputs to third-party access control systems like Gallagher, Inner Range, and Genetec.