Fire alarm communicators: replacing the phone lines on your fire panel

Who this page is for

• Your building has a fire alarm panel monitored by an outside company, and the panel dials out on one or two copper lines.
• Your carrier sent a notice, or your alarm company told you the lines must change.
• You want to know what the fire marshal will ask before you approve a quote.
• You are deciding between a dedicated fire communicator and a box that also handles other lines.

The problem in plain terms

Look at the fire panel and you will usually find two phone cables running to an RJ31X jack. Those are the panel’s two lines. When the panel needs to report an alarm, it grabs one line, dials the monitoring company and sends coded tones.

When the copper goes, the panel still rings the bells inside. It just can’t tell anyone outside. A properly supervised panel will show a communication trouble, and the monitoring company should see failed test signals.

What NFPA 72 Chapter 26 says about transmission

NFPA 72, the National Fire Alarm and Signaling Code, sets how signals travel from a protected building to a supervising station in Chapter 26. NFPA issues new editions every few years; the current one is 2025 (NFPA errata for the 2025 edition). Your state or city may enforce an older edition.

The traditional dialer rule. A DACT historically used two phone lines. The Minnesota State Fire Marshal explains that under the 2016 changes a DACT can use one telephone line plus a secondary means that is not a second phone line, such as cellular, radio or IP.

Other technologies. Minnesota also says NFPA 72 moved to a performance-based approach. A newer technology can be used if it meets Chapter 26 (Section 26.6) and the secondary power rules in Section 10.6.7.

Single and multiple paths. North Carolina’s State Construction Office summarizes the 2013 edition this way (NC SCO):

• A single communication path must be supervised at least every 60 minutes, and it is allowed unless the AHJ, laws, codes or standards prohibit it.
• With multiple paths, each path must be supervised within not more than 6 hours, and a path failure must reach the supervising station within 6 hours.
• One technology can create multiple paths if the multipath rules are met.
• Shared on-premises communications equipment needs 24 hours of secondary power, with an 8-hour exception when the authority approves it after a risk analysis.

Managed voice networks. When a dialer stays on a phone-style line, that line generally has to be a managed facilities-based voice network (MFVN), not ordinary internet VoIP. New Jersey’s 2011 bulletin lists the conditions it used, including 8 hours of standby power for premises equipment and testing of line seizure by an approved fire alarm contractor.

Plain VoIP. Minnesota says VoIP is “not recommended for transmitting fire alarm signals” because compression affects the alarm data.

Who decides: the AHJ, the monitoring company and the alarm contractor

Three parties have to agree, and they have different jobs.

• The authority having jurisdiction (AHJ). Usually the fire marshal or the building department. It decides whether the new path is acceptable, and it may require a permit, drawings or an acceptance test.
• The monitoring company (supervising station). It must support the communicator’s network and signal format, update your account, and confirm it receives alarm, trouble and supervisory test signals.
• The licensed fire alarm contractor. Installs and programs the communicator, connects it to the panel and documents the tests. Your state may require a fire alarm license for this work.

Your insurer may also have conditions. Ask before the work starts, not after.

What UL and fire marshal listings mean

Listings tell the AHJ that a device was tested to a standard. They do not approve your building.

• UL 864 is the standard for fire alarm control units and accessories. Napco says its StarLink Fire Max 2 communicators are UL 864 listed and offer single path, dual path and a cellular-only dual path option on Verizon and AT&T (Napco).
• California State Fire Marshal (CSFM) listing. Ooma says CSFM listed AirDial as a cellular communicator for compatible fire alarm control units, and that a third-party firm certified it to UL 864 (Ooma release). Granite says CSFM approved EPIK for listing in 2022.
• FDNY approval. New York City reviews POTS replacement devices separately. Granite says the FDNY approved EPIK as an MFVN on November 23, 2022 (Granite).

Ask any vendor for the listing document itself, with the model number, and give it to your alarm contractor.

Dedicated communicator vs POTS in a box for fire alarms

	Dedicated fire communicator	POTS in a box with a fire-listed port
Example	Napco StarLink Fire Max 2	Ooma AirDial, Granite EPIK
How it works	Connects to the panel and sends signals over its own cellular (and sometimes IP) network to the monitoring company	Panel keeps dialing tones into an analog port; the box carries them over a managed network
Who sells and installs	Your alarm company	A telecom provider, with your alarm company testing
Paths	Single, dual or cellular-only dual path, by plan (Napco)	Depends on the box; ask how the fire marshal will count paths
Other lines	Fire panel only	Also elevator, gate, fax
Pricing info (October 2026)	Dealer pricing, not published	No published prices
Best when	The AHJ or alarm company wants a listed communicator tied to the panel	Several line types share one room and the fire use is accepted locally

I don’t work with Napco, which sells through alarm dealers. For many fire panels, asking your alarm company to quote a dedicated communicator first is the right move. Granite itself notes that some jurisdictions may require wireline connections for fire and life safety (Granite). More on the box approach in POTS in a box explained.

What it costs

No dedicated fire communicator maker or gateway vendor I reviewed publishes a price. Napco describes “a new low equipment cost & monthly rate” through dealers, with no number.

What drives cost:

• The communicator hardware and the alarm contractor’s labor
• Monthly cellular service, often billed by the alarm company with monitoring
• Monitoring fees, which may change when the account moves to a new network. North Carolina notes that a building owner using a private UL-listed receiving station pays a monthly monitoring fee plus the cellular line cost.
• Permit and inspection fees, if your AHJ requires them
• Panel upgrades, if an old panel cannot connect to a modern communicator

Compare your two copper lines against a quote in the POTS cost calculator.

My recommendation by scenario

• One building, one panel, an alarm company you trust: ask them for a listed dedicated communicator quote. It is the shortest approval path in most places.
• Several line types in one room and a local AHJ that has accepted MFVN devices: a fire-listed POTS in a box can cover the panel and the rest. Get the AHJ’s answer in writing first.
• Portfolio across several cities: don’t standardize the fire panel yet. Standardize the other lines, and let each AHJ shape the fire panel choice. My property manager guide explains how to schedule it.
• Schools and public buildings: check state facility rules on top of the fire code. North Carolina, for example, requires State Construction Office review. See POTS replacement for schools.

How implementation works

1. Ask the AHJ what it accepts and whether a permit is needed (1 to 3 weeks).
2. Ask the monitoring company which communicators and networks it supports.
3. Get quotes: one dedicated communicator, one gateway option.
4. The alarm contractor installs, programs and sends alarm, trouble and supervisory test signals.
5. Unplug the primary path and confirm the trouble signal reaches the monitoring company within the required time.
6. Complete any acceptance inspection, then cancel copper.

Questions to ask your alarm company

• Which communicator do you recommend for my panel model, and is it listed for it?
• Is this a single path or dual path design, and has our AHJ accepted it before?
• Which cellular carriers does it use, and how is signal at the panel?
• Does my monitoring rate change?
• Do we need a permit or an acceptance test?
• How long does the communicator run on the panel's batteries?

Common mistakes

1. Moving the panel to a cheap ATA. Alarm data fails over compressed VoIP, often without anyone noticing until a test.
2. Telling the monitoring company last. The account has to be reprogrammed for the new communicator.
3. Counting two SIM cards as two paths. Ask the AHJ how it counts paths for your design.
4. Skipping the trouble test. Unplug the path and prove the failure is reported.
5. Forgetting the elevator recall and other panel tie-ins. The communicator change should not disturb them; test them too. For the cab phone itself, see elevator phone lines.

Elevator landings and areas of refuge often have their own two-way stations; see emergency call boxes. For the full plan across all line types, see the POTS line replacement guide, or request fire alarm communicator quotes.