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Tired of walking to the front door every time someone buzzes? Modern VoIP systems let you see who's at the door, talk to them, and unlock it — from your desk phone, computer, or cell phone.
Someone buzzes the front door. The receptionist is on a call. The office manager is in a meeting. Nobody's near the intercom panel by the entrance. The visitor stands there pressing the button, wondering if anyone's in the office. Eventually they call the main number on their cell phone and ask to be let in — which means a staff member has to walk to the front door anyway.
This happens dozens of times a day in offices, medical practices, law firms, and buildings across New York City. The traditional buzzer-and-intercom system was designed for a world where someone always sat at the front desk. That's not how offices work anymore.
The fix is surprisingly simple: connect your door phone to your VoIP phone system. When someone buzzes, it rings your desk phone, your mobile app, or both — and you can unlock the door with a button press without leaving your chair.
A VoIP-connected door phone is a small intercom unit mounted next to your front door (or lobby entrance, gate, or loading dock). It connects to your phone system over your office network — the same network your desk phones are on. When a visitor presses the call button:
The entire interaction takes 10 seconds. No walking to the door. No shouting "who is it?" through the wall. No leaving a client on hold while you deal with a delivery.
This is the feature that changes everything for offices without a dedicated receptionist. When the door phone rings, it can ring your mobile app just like any other call. You're in a meeting across town? Answer on your phone, see who's at the door (if the unit has a camera), and buzz them in remotely. You're working from home on a Wednesday? Same thing.
For medical offices, this is especially useful. A patient arrives for an appointment, buzzes the door, and the front desk lets them in without leaving the check-in window. After hours, a doctor working late can see who's at the door from their phone before deciding whether to open it — a safety feature that matters in NYC.
A SIP door phone is a purpose-built intercom that registers on your VoIP phone system as an extension. Leading manufacturers include:
All of these mount next to the door, connect to your network with a single Cat6 cable (PoE powered — no separate electrical outlet needed), and register on your Callifi phone system as an extension.
To actually unlock the door remotely, you need an electric lock:
The door phone unit has a relay output that connects to the electric lock. When you press the unlock button on your phone, the door phone triggers the relay, the lock releases, and the door opens. Callifi handles the cabling between the door phone and the lock hardware.
The door phone registers on your Callifi phone system like any other extension. We configure the call routing (who it rings when someone buzzes), the unlock code (which button or DTMF tone triggers the relay), and any video feed integration. If you already have a Callifi system, adding a door phone is a straightforward project — usually done in a single visit.
One door phone by the front door. Buzzer rings the receptionist's desk phone. If no answer in 15 seconds, rolls to the office manager's phone and mobile app. Either person can unlock the door with a button press. After hours, buzzer goes to voicemail with a greeting: "Our office is currently closed. Please leave a message or call (212) 423-1234 during business hours."
Door phone at the entrance to the suite. Patient buzzes, front desk sees the camera feed and unlocks the door. After hours, the door phone rings the on-call provider's mobile app — they can see who's at the door before answering. For practices that share a building entrance, a second door phone at the building lobby entrance can be added.
Many NYC law firms want a secured entrance where visitors can't just walk in. Door phone with camera by the main door. Receptionist verifies the visitor visually, announces them to the attorney via BLF/intercom, and unlocks the door. Some firms add an RFID card reader so staff can badge in without buzzing — the Grandstream GDS3712 has this built in.
A multi-button door phone in the lobby with a button for each tenant (or a directory where visitors dial the tenant's extension). The call goes to the tenant's phone system. The tenant buzzes the visitor in. The building owner doesn't have to manage a separate intercom system — it runs through each tenant's VoIP service. See our building owner services.
If your office already has a traditional buzzer/intercom system, you have two options:
Replace it entirely. Remove the old intercom panel, install a SIP door phone, and connect it to your VoIP system. This is the cleanest solution and gives you camera, mobile app, and full integration. Usually the best option if your existing system is old or unreliable.
Integrate with an adapter. Some VoIP gateways can bridge a traditional analog buzzer system to your VoIP phone system. The old door unit stays, but when someone buzzes, the call routes through your VoIP system instead of the old intercom wiring. This is a compromise — you keep the existing hardware but gain VoIP routing. No camera, but it works if the building won't let you replace the intercom panel.
A basic SIP door phone unit (no camera) runs $150-300. A unit with HD camera and RFID reader runs $300-600. Electric strike hardware is $50-200 depending on the door type. Installation labor covers mounting the unit, running the Cat6 cable, connecting the lock hardware, configuring the extension on your phone system, and testing. For a single-door office, the total project is typically under $1,000 installed — and it saves your staff from walking to the front door 20 times a day.
Callifi installs SIP door phones as part of new phone system installations or as add-ons to existing Callifi systems. We supply the door phone unit, handle the cabling, configure the extension and routing, coordinate with your locksmith if electric lock hardware is needed, and test everything end-to-end.
If you're not sure which door phone setup makes sense for your office, call (212) 423-1234 or contact us. We'll look at your door, your lock, and your phone system and recommend the right solution.
