Your POTS Lines Have a Deadline: What the 2026 Copper Shutdown Means

For years, the advice on POTS lines was "you should probably migrate off copper eventually." Eventually is here. AT&T has announced that copper service discontinuance in selected areas begins in summer 2026, with a stated goal of retiring the majority of its copper footprint by the end of 2029; and the schedule is carrier- and wire-center-specific, with affected customers receiving location-specific notices. Verizon, Lumen, and other carriers have their own copper retirement programs at various stages. If you still have Plain Old Telephone Service lines anywhere in your organization, this is no longer a planning exercise. It is a deadline.

The phones themselves are probably fine. Most businesses migrated voice to VoIP years ago. The problem is everything else that is still plugged into a copper pair: fire alarm panels, elevator phones, security systems, fax machines, and the collection of legacy devices that nobody thought about because the POTS lines just quietly worked and the monthly bill was small enough to ignore.

That bill is not small anymore.

The price signal you should not ignore

POTS line costs have been climbing steadily. Businesses that were paying $20-30 per line a few years ago are now seeing $80-150 or more. This is not accidental. Carriers are pricing copper to encourage migration. Maintaining aging copper plant is expensive, and carriers would rather invest in fiber and wireless infrastructure. Higher prices push remaining customers to move, which reduces the subscriber base that justifies keeping the copper network operational.

If you are still on POTS and you have not noticed the price increases, check your telecom invoices. The lines that were "cheap enough to keep" may now be the most expensive phone lines in your building.

The price increase is the warning shot. The copper retirement filing is the deadline.

What is actually at risk

Your desk phones are almost certainly on VoIP already. The risk is the analog infrastructure that was never migrated because it was working fine and nobody had a reason to touch it.

Fire alarm panels

This is the highest-stakes item. Fire alarm communicators dial out to a central monitoring station when an alarm triggers. Most installations use two dedicated POTS lines: a primary and a backup. The panel regularly tests these lines by placing supervision calls to verify they are functional.

When the copper is decommissioned, those lines go dead. The fire alarm will still trigger locally (the horns and strobes will still work), but the signal to the monitoring station will not go through. Nobody gets dispatched. The fire department does not get called automatically. What the panel itself reports depends on the panel and communicator: many will detect the loss of loop voltage and raise a trouble condition, but supervision behavior varies, and a decommissioned line can fail differently than a cut wire: do not assume the panel will warn you.

You cannot solve this with a generic ATA. Plugging the fire panel into an ordinary VoIP adapter does not meet NFPA 72 requirements for listed equipment, supervision, and backup power, and will not satisfy your AHJ (Authority Having Jurisdiction). That does not mean IP paths are categorically prohibited; UL-listed cellular and IP communicators (including listed dialer-capture modules) exist precisely for this transition, but the replacement path must be designed, listed, and approved for the application, not improvised. This is covered in detail in Why Fax, Fire Alarms, and Elevators Resist VoIP.

What to do: Contact your alarm monitoring company now. Ask about cellular or UL-listed IP communicators. These are listed devices with their own battery backup and supervised connection, purpose-built for fire alarm communication. Most monitoring companies have been migrating customers to cellular for years and have a straightforward upgrade path. Coordinate the timeline with your AHJ: some jurisdictions require approval before changing the alarm communicator type.

Do not wait for the copper disconnection notice. The monitoring company and the AHJ both need lead time, and if everyone in your wire center waits until the last month, there will be a backlog.

Elevator phones

Building codes require a phone in the elevator cab that works during power outages and connects to a live person without the passenger needing to dial a number. POTS lines meet this inherently. A generic ATA on ordinary VoIP service does not, for the same reasons as fire alarms: power dependency, multiple points of failure, and no way for the phone to know the path behind the ATA is broken. IP or cellular paths are acceptable when the solution is designed for the application and approved by the relevant authority.

The most common replacement is a cellular elevator phone line. These devices are independent of your building's network and power, with their own battery and cellular connection. Managed elevator phone services handle the hardware, connectivity, compliance documentation, and testing.

What to do: Contact your elevator maintenance company or a managed elevator phone service. Budget for the hardware and monthly cellular service. If your building has multiple elevators, all of them need to be converted.

Security and burglar alarm systems

Security panels work similarly to fire panels: they dial a monitoring station over POTS lines. The consequences of failure are less severe (property loss vs. life safety), and the regulatory requirements are less stringent, but the migration path is the same.

Many security alarm companies have already been pushing cellular upgrades. If your security panel is still on copper, your alarm company almost certainly has a cellular communicator they can install. This is often the simplest migration of the bunch.

What to do: Call your security monitoring company. Ask if your panel is still on copper and what the cellular upgrade looks like. This is often a single service visit.

Fax machines

Fax over POTS has been reliable for decades. Fax over VoIP is unreliable for reasons covered in Fax Over IP: Why Faxing Over VoIP Is Unreliable and What to Do About It. But unlike fire alarms and elevator phones, fax has mature alternatives that do not require copper:

Fax-to-email services move faxing off the phone system entirely. Inbound faxes arrive as email attachments, outbound faxes are sent via a web interface. No fax machine, no phone line, no compatibility issues. For most businesses, this is the right answer.

T.38 fax relay handles fax over VoIP by converting the tones to data at each end. This works when both sides support T.38. It is more reliable than G.711 passthrough but still less reliable than POTS or fax-to-email.

What to do: Ask whether fax is actually still necessary for the business. If it is, evaluate fax-to-email services. If physical fax machines must stay, T.38 through your VoIP provider is the next best option.

Everything else

Walk your buildings. Look for RJ11 jacks in unexpected places. Common discoveries:

• Postage meters that phone home to download postage (most modern meters connect via IP or cellular now)
• Older credit card terminals that dial out for authorization (modern terminals use IP or cellular)
• Building management systems with modem connections for remote monitoring
• Gate and access control systems with phone line connections
• Weather monitoring equipment, irrigation controllers, or other specialty devices

For most of these, an ATA is an acceptable temporary bridge while you source an IP-native or cellular replacement. The stakes are lower: a postage meter that fails to download postage is an inconvenience, not a safety issue.

How to audit your POTS exposure

You need to know two things: which lines you have and what is connected to them.

Step 1: Pull your telecom invoices

Get a complete list of every active POTS line billed to your organization. Include all locations. Check for lines that may be billed under a different account or bundled with other services. The billing records are the definitive source: people forget about lines, but the invoices do not.

Step 2: Trace each line physically

For every line on the invoice, find where it terminates in the building. Follow the wire from the demarc to the device. Document what is connected. You will likely find lines you did not know about connected to devices nobody remembers installing.

Step 3: Classify by migration path

For each device, determine the right replacement:

| Device | Migration path | Urgency | |--------|---------------|---------| | Fire alarm panel | Cellular communicator (coordinate with monitoring company + AHJ) | High: life safety, longest lead time | | Elevator phone | Cellular elevator phone service | High: code compliance, needs building management coordination | | Security panel | Cellular communicator (coordinate with monitoring company) | Medium: straightforward upgrade | | Fax machine | Fax-to-email or T.38 | Medium: business impact varies | | Everything else | ATA bridge or IP-native replacement | Low: evaluate case by case |

Step 4: Check your carrier's timeline

Contact your carrier (or check their copper retirement notices) for your specific locations. The timeline varies by wire center. Some locations may have more time than others. Some may have less time than you expect.

Use our carrier lookup tool to verify the current carrier and line type for each number. If a line has already been ported or reclassified, that is information you need before planning the migration.

Step 5: Schedule the work

Start with fire alarms and elevator phones. These have the longest lead times because they involve third parties (monitoring companies, AHJs, elevator contractors) and compliance requirements. Do not leave these for last.

The timeline

If you are in one of the AT&T areas where discontinuance begins in summer 2026, you have weeks to months, not years. Watch for the location-specific notice. Even if your specific wire center is later in the schedule, the direction is clear: AT&T has said it intends to be off the majority of its copper footprint by the end of 2029, and copper is going away. Starting now means you migrate on your schedule. Waiting means you migrate on the carrier's schedule, possibly with less support and fewer options as demand for migration services spikes.

The POTS line that has been quietly working in the corner for fifteen years is about to stop working. Find it before it finds you.

For the technical details on why specific analog devices resist VoIP conversion, see Why Fax, Fire Alarms, and Elevators Resist VoIP. For fax-specific guidance, see Fax Over IP: Why Faxing Over VoIP Is Unreliable and What to Do About It.