Bottom line

Choosing a video intercom or door station comes down to three variables that cascade into everything else: network architecture (IP/PoE versus analog), where calls need to be answered (dedicated master station, mobile app, or both), and the environmental demands at the door itself. IP-based PoE systems dominate new commercial installations because they run on existing structured cabling, integrate with VMS and access control platforms, and support mobile answering without a separate gateway — but they require a managed PoE switch and IT coordination that analog systems sidestep. Match the door station's IP rating, form factor, and ecosystem before any other spec.

Video intercoms span a wide range of architectures and use cases — from a single-door office entry to a multi-tenant residential tower with a lobby directory. The factors below determine which platform and hardware actually fits your project.

• IP vs. analog architecture: IP/SIP-based systems ride standard Cat5e/6 runs, support software-based management, and can ring smartphones or any SIP endpoint. Analog and proprietary 2-wire systems are simpler to wire in retrofit situations but lock you into a specific vendor ecosystem for expansion and cannot natively reach mobile devices without an adapter.
• PoE availability at the door: Most modern IP door stations are PoE-powered (802.3af/at), eliminating a separate 12/24 V power run. Confirm your switch port delivers adequate wattage — heated/IR models can draw more than standard PoE budgets — and that cable runs stay within 100 m (328 ft) of the nearest switch.
• Answer point — master station, app, or hybrid: Dedicated master/guard stations (hardwired indoor units) give reliable, always-on answering with one-touch door release. Mobile app answering adds flexibility but depends on Wi-Fi/cellular reliability and staff discipline. Many enterprise deployments use both: a guard station at the desk plus mobile for roaming personnel.
• Environmental rating at the door: Exterior-facing doors need at minimum IP54 (splash-resistant); exposed façades or loading docks warrant IP65 or higher. Check operating temperature range against local extremes — wide-range units (-30 °C capable) are essential for cold-climate installations. Vandal resistance (IK rating) matters at high-traffic or unsupervised entries.
• Multi-tenant directory and call routing: For apartment buildings or multi-suite commercial, look for built-in directory support (virtual or physical keypad), tenant-to-mobile call forwarding, and easy tenant management via a web portal. Not all door stations include this natively — some require a separate controller or software license.
• Access control integration: Door stations that output a dry-contact relay or integrate via OSDP/Wiegand with an access panel give you unified audit trails and credential management. Pure video intercom systems that operate a door release only via their own app or master station can create siloed records — evaluate whether that matters for compliance or reporting requirements.
• Video quality, field of view, and night vision: At a door station the camera needs to capture a usable face image at 0.5–1.5 m, not a wide-area scene. Look for wide dynamic range (WDR) to handle backlit doorways, a narrow-to-moderate FOV (90–120°), and IR or white-light illumination for low-light identification rather than raw megapixel count.

Can I answer a door station call on my smartphone?

Yes — IP/SIP-based door stations can ring any SIP-compatible app or a vendor's own mobile client over your LAN or the internet. The key dependencies are a stable Wi-Fi or cellular connection for the staff member, correct SIP server configuration (or a cloud relay the vendor provides), and a firewall/NAT rule that lets the call reach the phone. For mission-critical entries, pairing mobile answering with a hardwired master station is the more reliable design so that the door can always be answered even if a phone is out of range.

What is the difference between a door station and a master station?

A door station is the outdoor-facing unit — it houses the camera, microphone, speaker, and typically a call button or keypad, and is built to survive weather and physical abuse. A master station (also called a guard station or indoor station) is the interior unit that receives the call, displays the video feed, and sends the door-release signal; it lives in a conditioned indoor environment and prioritizes screen size, audio quality, and ease of use for the person answering. In IP systems, a master station can often be replaced or supplemented by a software client or mobile app, but a dedicated hardware station remains the most reliable answer point for high-call-volume or 24/7-staffed positions.

How do I choose between a proprietary intercom system and a SIP-based open platform?

Proprietary systems (where the door station and master station are from the same vendor's closed ecosystem) are typically easier to commission and may offer tighter feature integration — directory management, call history, and door release all work out of the box. SIP-based open platforms give you flexibility to mix hardware, integrate with a PBX, and route calls to standard desk phones or softphones, but require more upfront configuration and a competent SIP administrator. For single-site commercial with a clear vendor preference, proprietary is often the faster path; for multi-site enterprise, PBX integration, or future-proof flexibility, SIP is the stronger architectural choice.

What IP rating do I need for an outdoor door station?

IP54 is the minimum for a protected exterior location such as a recessed vestibule or covered awning where the unit is not directly exposed to rain. For fully exposed façades, loading docks, or installations in jurisdictions with heavy precipitation, IP65 or IP66 is the appropriate spec — these ratings confirm the enclosure is dust-tight and can withstand directed water jets. If the installation is in a climate with hard freezes, also verify the operating temperature floor of the door station independently of the IP rating, since IP ratings say nothing about thermal performance.

Do I need a separate access control panel if my door station has a relay output?

It depends on your security and audit requirements. Many door stations include a built-in dry-contact relay that can directly drive an electric strike or magnetic lock — adequate for low-security single-door applications where a simple call-and-release workflow is sufficient. If you need credential-based access (cards, PINs, mobile credentials), time-based schedules, per-user audit trails, or integration with a larger security management platform, a dedicated access control panel connected to the door station is the right architecture. The two are complementary: the intercom handles visitor call-in, the access panel handles credentialed entry.

What cabling do I need for a PoE door station?

Standard Cat5e or Cat6 UTP is the correct cable for PoE IP door stations, with a maximum run of 100 m (328 ft) from the PoE switch port to the device — this is an Ethernet protocol limit, not a vendor choice. Use shielded cable (STP/FTP) in environments with high EMI such as near elevator shafts, motor rooms, or industrial equipment. Confirm the PoE budget of your switch port against the door station's power draw specification, particularly for models with built-in heaters or high-power IR illuminators that can exceed the 15.4 W of standard 802.3af and require 802.3at (PoE+) or higher.

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