Smart Entry. Secure Access.
Modern video intercoms that bridge the gap between communication and access control, allowing you to manage visitors from anywhere.
Not ready for a full quote? Talk to an engineer first.
ZEI deploys IP and SIP-based intercom systems that connect entry stations to mobile apps, desk phones, and security operations — bringing visitor management, video, and access control into a single workflow. Aiphone, 2N, Akuvox, and Comelit hardware integrated with leading access platforms.
Technology Partners
A representative environment where ZEI engineers, deploys, and supports intercom systems.
Where current systems fall short.
- Visitors waiting at a locked door because no one is at the desk
- Lobby staff handling visitor entry manually with paper logs
- No video record of who was at the door before access was granted
- Disconnected intercom systems on legacy phone wiring impossible to extend
- Multi-tenant buildings with no scalable visitor experience
Intercom Capabilities
Upgrade your entry points with high-definition video and two-way audio.
HD Video Door Stations
See exactly who is at the door with wide-angle, high-definition cameras and noise-canceling microphones.
Mobile App Integration
Receive push notifications, view live video, and unlock doors directly from your smartphone.
Access Control Integration
Seamlessly tie intercom events to your broader access control and video surveillance platforms.
Visitor Management
Issue temporary QR codes or PINs for contractors and guests, complete with audit trails.
What gets installed.
A real deployment is more than the headline product. These are the components we typically specify and integrate.
Door / entry stations
IP video door stations with HD wide-angle cameras, noise-canceling microphones, and tamper-resistant mounting (Aiphone, 2N, Akuvox, Comelit).
Master / answering stations
Desk consoles, IP phones, or mobile app endpoints that ring on entry call.
Mobile app
Push notifications with live video and one-tap door release for receptionists or remote managers.
Visitor management portal
Pre-registration with one-time QR codes / PINs and audit-logged entry events.
Access control bridge
Tight integration with the access platform so unlock events are logged and access policies are honored.
Network / SIP infrastructure
PoE switching for door stations; SIP / VoIP routing for call distribution; QoS on voice traffic.
Connects to what you already run.
Our intercom systems integrate with your existing identity, communication, and security systems for unified operations.
How it gets built.
Every project follows the same engineering-led sequence — designed, documented, and delivered with no surprises.
- 01
Use-case mapping
Define every entry where visitors arrive, who answers, when, and what happens after.
- 02
Hardware selection
Choose station type (single button, multi-button, keypad, full visitor screen) per entry based on visitor volume and tenant model.
- 03
Network & wiring
PoE drops, network configuration, SIP setup, and call routing tables prepared.
- 04
Install & integration
Stations mounted, master endpoints configured, access platform integration tested.
- 05
Visitor portal launch
Pre-registration, host directory, and visitor flow tested end-to-end.
- 06
Acceptance & training
Front-desk and remote-mobile users trained on call answer, video review, and door release.
What our engineers look for.
- Door station camera placement and lensing capture face plus shoulders at typical visitor distance — not just a forehead at the lens.
- Network architecture isolates intercom traffic on its own VLAN with proper QoS for call quality.
- Call routing logic is designed: business hours to receptionist, after hours to a guard service or to a list of mobiles.
- Tamper detection and outdoor IP rating (IK protection) prevent vandalism on accessible stations.
- Privacy compliance: clear signage, retention policy, and access controls on visitor video and logs.
After the install.
Service tiers built around what your facility actually needs — not a one-size-fits-all SLA.
Annual on-site inspection, firmware updates, and remote support.
Semi-annual preventive maintenance, 24/7 remote monitoring, and 4-hour priority response.
Fully managed visitor flow administration, host directory updates, and integration health monitoring.
Intercom Architectures
Choose the right communication platform for your facility.
Cloud-Based Intercoms
Direct-to-cloud stations with mobile-first management.
- No on-premise servers
- Remote unlocking
- SIP/VoIP compatible
- Easy multi-tenant setup
Enterprise SIP Systems
Traditional PBX-integrated systems for large campuses.
- Integrates with existing phone systems
- Hardwired reliability
- Complex call routing
- Legacy support
Where this system fits.
Condominiums
Elevating the resident experience while securing property perimeters, amenities, and common areas with smart building technology
Healthcare
Securing hospitals, clinics, and pharmacies while maintaining strict HIPAA compliance and ensuring a safe environment for patient care
Education
Creating safe learning environments with integrated lockdown systems, vape detection, and campus-wide mass notification
Government
NDAA-compliant security infrastructure designed to protect municipal, state, and federal government facilities and personnel
Hospitality
Discreet, high-performance security and networking solutions that protect guests and staff without disrupting the hospitality experience
Banking
Protecting financial assets, sensitive data, and personnel with integrated security systems that meet strict regulatory requirements
Retail
Integrated loss prevention and retail analytics to protect your bottom line while gathering actionable intelligence on customer behavior
Often deployed together.
Access Control
ZEI deploys cloud-managed and enterprise access control across single-door deployments and multi-site campuses
Video Surveillance
ZEI engineers commercial video surveillance systems built around modern IP cameras, edge AI analytics, and cloud or on-premise video management
Commercial A/V
ZEI designs and integrates commercial audio-video systems that work the first time and every time after — Microsoft Teams Rooms and Zoom Rooms, distributed audio and digital signage, sound masking, and acoustic treatment, all centrally managed and serviced by our team
Entry Gates
ZEI installs and services industrial-grade entry gates — slide, swing, barrier, and crash-rated — engineered for high-cycle reliability and integrated with access control, LPR, and intercoms
From the engineering blog.
Background reading our team uses when designing intercom systems systems.
The End of Keycards?
For decades, the plastic RFID keycard has been the undisputed standard for commercial access control.
OSDP: Why Wiegand Is Dead and What Replaces It
For over four decades, the Wiegand protocol has been the default communication link between access control readers and panels.
Designing the Network Backbone for a 500+ Camera Deployment
Designing a network for a handful of IP cameras is straightforward. Designing one for 500 or more is an entirely different discipline.
Frequently asked.
IP intercom or SIP-based — what's the difference?
Can visitors call us on our mobiles when no one is at the desk?
Do you integrate with our access control?
Is video stored from intercom calls?
Multi-tenant buildings — how does this work?
Let's build your system.
Tell us about your facility. Our engineering team will design a system tailored to your security, connectivity, and automation requirements.
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