POTS in a Box: the device that replaces your copper phone line
A "POTS in a Box" is a small cellular device that replaces a traditional copper phone line. It plugs into the existing RJ11 phone jack in your building and emulates an analog signal over 4G/5G cellular. Your fire alarm panel, elevator phone, security system, or fax machine plugs into it exactly as it did with copper — the equipment never knows the difference.
This is the single most important technology in the copper retirement. Without it, there is no compliant way to keep fire alarms, elevator phones, and security systems operational after copper is disconnected. Standard VoIP does not work for these systems — the signal handshake corrupts and the equipment fails inspection.
CopperAlerts is a vendor-neutral telecom broker. We work with every major POTS-in-a-box manufacturer and recommend the right device for your specific building, systems, and budget. This guide compares the top options so you can understand what's available.
How POTS in a Box works
The concept is simple, even though the engineering behind it is sophisticated:
- Step 1: The copper phone line is disconnected from the RJ11 jack on your fire alarm panel (or elevator phone, security system, etc.)
- Step 2: The POTS-in-a-box device is mounted on the wall near the panel and connected to the same RJ11 jack
- Step 3: The device creates an analog signal that is electrically identical to what the copper line provided — same voltage, same loop-start signaling, same dial tone
- Step 4: When the fire alarm triggers, the DACT picks up the "phone" and dials the monitoring station. The device routes that call over 4G/5G cellular instead of copper. The monitoring station receives the alarm signal exactly as before.
The equipment never knows copper is gone. The monitoring station never knows copper is gone. The fire inspector sees a certified device and passes the building. Everyone is happy.
VoIP converts analog to digital packets over the internet. Fire alarm signals corrupt during this conversion. VoIP fails NFPA 72 inspection.
POTS in a Box emulates analog over a managed cellular network. The signal stays intact. The device is specifically certified for life-safety applications. It passes inspection.
These are not the same thing. A building that moves its desk phones to RingCentral still needs separate POTS-in-a-box devices for its fire alarm and elevator phones.
What to look for in a POTS-in-a-box device
Not all devices are equal. Here's what matters when choosing a POTS-in-a-box for your building:
- NFPA 72 certification — required for fire alarm panel connections. Without it, your building fails fire inspection.
- ASME A17.1 compliance — required for elevator emergency phones. Must provide two-way voice during power outages.
- UL listing — Underwriters Laboratories certification for safety. Most inspectors require it.
- Battery backup — critical for elevator phones (must work during power failure) and fire alarms (NFPA 72 requires 24-hour standby).
- MFVN compliance — Managed Facilities Voice Network. NFPA 72 requires fire alarm signals to stay on a private managed network, never traversing the public internet.
- Dual-SIM or dual-carrier — automatic failover to a second cellular carrier if the primary loses signal. Critical for mission-critical lines.
- Number of ports — some devices support 1–2 lines, others support 4. More ports per device means fewer devices to install.
- Remote monitoring portal — web dashboard showing device status, signal strength, battery levels, and alerts across all your buildings.
Top POTS-in-a-box vendors compared
Ooma AirDial
~$49/line/monthThe most recognized name in POTS replacement. Ooma AirDial is a plug-and-play device with 4 FXS ports (supports up to 4 lines per device), MultiPath technology that routes traffic over both LTE and wired ethernet simultaneously, and a 16-hour battery backup extendable to 24+ hours with an optional external battery.
The remote device management portal provides real-time visibility into every device across all locations with SMS and email alerts for outages, battery status, and signal strength. Role-based access lets building managers and technicians share the portal without sharing credentials.
Best for: SMB and single-building deployments. Hotels, condos, office buildings, and any property that wants a proven, brand-name solution with strong support.
DataRemote POTS IN A BOX
~$45–65/line/monthDataRemote's device stands out for its dual-SIM redundancy — two different cellular carriers in one device with automatic failover. If T-Mobile loses signal, the device instantly switches to AT&T (or vice versa). This makes it the strongest option for fire alarm and security applications where a missed dial is not acceptable.
Native support for alarm dialer protocols means cleaner integration with central station monitoring. Strong partnerships with alarm companies make DataRemote popular in the fire and security channel.
Best for: Fire alarm and security accounts where reliability is the top priority. Alarm company partnerships. Buildings in areas with variable cellular coverage.
RCN Technologies POTS Link
Custom pricingRCN POTS Link offers dual-carrier automatic failover with a 19-day average deployment time — the fastest in the industry. Backed by a 24/7 US-based Network Operations Center (NOC) for monitoring and support. Strong track record in government, K-12 schools, and municipal buildings where procurement processes are complex.
Best for: Government buildings, K-12 school districts, municipal facilities. Organizations that need fast deployment and US-based 24/7 support.
Granite EPIK
~$45–65/line/monthFull-service managed POTS replacement solution with US-based support. Granite handles everything from site survey to installation to ongoing management. High-touch option for building owners who want a white-glove experience and don't want to manage the technology themselves.
Best for: Small-to-mid deployments where the building owner wants a fully managed, hands-off solution with dedicated support.
MetTel
Custom / enterprise pricingCarrier-grade POTS replacement for large enterprises with enterprise SLAs, dedicated account management, and multi-site rollout capabilities. MetTel is the choice for national accounts with 20+ locations that need consistent deployment and support across every site.
Best for: Large multi-site enterprises, national hotel chains, hospital networks, and organizations with 20+ locations.
Side-by-side comparison
| Feature | Ooma AirDial | DataRemote | RCN POTS Link | Granite EPIK | MetTel |
|---|---|---|---|---|---|
| Pricing | ~$49/line | $45–65/line | Custom | $45–65/line | Custom |
| NFPA 72 | ✓ | ✓ | ✓ | ✓ | ✓ |
| ASME A17.1 | ✓ | — | ✓ | — | ✓ |
| UL listed | ✓ | ✓ | ✓ | ✓ | ✓ |
| Dual-carrier failover | MultiPath (LTE+Ethernet) | ✓ Dual-SIM | ✓ Dual-carrier | — | ✓ |
| Battery backup | 16–24+ hours | Built-in | Built-in | Built-in | Built-in |
| Ports per device | 4 FXS | 2–4 | 2–4 | 1–2 | Varies |
| Remote monitoring | ✓ Portal + alerts | ✓ | ✓ 24/7 NOC | ✓ | ✓ |
| Avg deployment | 2–3 weeks | 2–4 weeks | 19 days | 2–4 weeks | Custom |
| Best for | SMB, single buildings | Fire alarm, security | Gov, K-12, municipal | Managed, hands-off | Enterprise, 20+ sites |
Why use a broker instead of going direct?
You can buy a POTS-in-a-box device directly from any of these vendors. So why go through CopperAlerts?
- Vendor-neutral recommendation — we recommend the device that fits your building, not the one that pays us the highest commission. Different buildings need different solutions.
- One audit covers everything — your building probably needs POTS-in-a-box for some lines and a cloud phone system for others. We handle both under one project instead of making you manage two separate vendors.
- Multi-vendor pricing — we quote multiple vendors competitively and get you better pricing than going direct in most cases.
- Compliance documentation — we provide the NFPA 72 and ASME A17.1 paperwork your building inspector requires, regardless of which vendor's device is installed.
- Installation coordination — we manage the installer, schedule the cutover, and handle the parallel testing. You don't need to become a telecom project manager.
Not sure which device is right for your building?
Our free audit identifies every copper line, matches the right POTS-in-a-box device to each system, and gives you a side-by-side cost comparison.
Schedule free auditOr call 305-482-1121
Frequently asked questions
What is a POTS in a box?
A POTS-in-a-box is a small cellular device that replaces a traditional copper phone line. It plugs into the existing RJ11 phone jack and emulates an analog signal over 4G/5G cellular. Fire alarm panels, elevator phones, and security systems plug into it exactly as they did with copper — the equipment never knows the difference. Devices include battery backup and are certified for NFPA 72 and ASME A17.1.
How much does a POTS in a box cost?
POTS-in-a-box devices typically cost $30–80 per line per month, which includes the device, cellular service, battery backup, and monitoring portal. Compare that to copper POTS lines at $150–500+ per line per month. Most buildings save 70–85% by switching.
Which POTS in a box is best for fire alarms?
For fire alarms, look for NFPA 72 certification, UL listing, and MFVN compliance. Ooma AirDial, DataRemote POTS IN A BOX, and RCN POTS Link all qualify. DataRemote's dual-SIM redundancy is particularly strong for fire alarm applications where reliability is critical.
Can I install a POTS in a box myself?
Some devices like Ooma AirDial offer DIY installation — plug into the jack, position the antenna, connect power. However, for fire alarm and elevator phone applications, professional installation is recommended to ensure proper signal strength, battery backup connection, and compliance documentation for inspectors.
How is POTS in a box different from VoIP?
VoIP converts analog to digital packets over the public internet. Fire alarm DACT signals corrupt during this conversion, and VoIP fails NFPA 72 inspection. POTS-in-a-box emulates the analog signal over a managed cellular network — the signal stays intact, the device is life-safety certified, and it passes inspection. They are two completely different technologies solving two different problems.
Do I need one device per line?
Not necessarily. Some devices like Ooma AirDial have 4 FXS ports and can serve up to 4 lines from one device. A building with 4 elevator phones on the same floor could potentially use one 4-port device. During the audit we determine the optimal device count and placement for your building.
Related resources
Who replaces copper lines for fire alarms, elevators & ATMs?
Fire alarm POTS replacement: NFPA 72 compliance
Elevator phone line replacement: ASME A17.1 requirements
POTS replacement for hospitals
POTS replacement for schools & K-12