For more than fifty years, plain old telephone service — POTS — has quietly carried some of the most important signals in a commercial building: fire alarm dialer trips, elevator emergency calls, alarm panel supervision, and the occasional fax. That era is ending in California through 2026, and every property owner with a life-safety system tied to copper needs a migration plan on paper today.
Why the copper is going away
In 2019, the FCC's Order 19-72A1 lifted federal price caps and lit up a formal path for incumbent local exchange carriers to discontinue legacy TDM services. AT&T and other providers filed for authority to retire copper facilities on a wire-center by wire-center basis. The California Public Utilities Commission has its own General Order 133-D notification framework layered on top. The practical result: your building's copper POTS lines are being sunset on a schedule that is largely outside your control, and the notice window is short — often as little as six months from formal notice to disconnect.
What actually stops working
When the copper is cut over, three life-safety systems are typically at risk:
- Fire alarm dialers. Every commercial fire alarm control panel monitored to a UL-Listed central station over POTS uses two dedicated dial lines under NFPA 72 legacy rules. Both go away.
- Elevator emergency phones. ASME A17.1 requires two-way communication between the elevator cab and a live person on a supervised line. Copper POTS has been the default for decades.
- Intrusion and monitored access alarms. Older intrusion panels use a POTS dialer as their sole reporting path.
Sprinkler waterflow and tamper switches, generator monitoring, and refrigeration alarms are often quietly tied to the same POTS lines through a shared communicator.
The Monitoring Association's guidance
The Monitoring Association (TMA) has been explicit: dual-path IP + LTE-M cellular signaling is the current best practice for fire alarm and life-safety monitoring, and it is fully compliant with NFPA 72 2022 and 2025 editions. A single sole-path cellular communicator is UL-Listed and code-compliant on its own for most occupancies, but dual-path is strongly recommended for high-value or high-occupancy buildings.
Your five-step migration plan
- Inventory every copper line in your building. Include fire alarm, elevator, intrusion, fax, and any modem-based equipment (data loggers, energy meters, PMS systems in hospitality).
- Confirm which are life-safety. Fire alarm and elevator phone lines are non-negotiable and code-driven. Everything else is a business decision.
- Choose a replacement path per line. For fire alarm: dual-path IP + LTE-M cellular communicator (Potter IPA-CID, DMP CellCom, Honeywell IPGSM, or equivalent). For elevator: a managed elevator phone service with cellular backhaul.
- File AHJ paperwork. Some California AHJs require formal notification when the supervising station or communication path changes. Get ahead of it.
- Cut over before the copper is disconnected. Do not wait for the AT&T notice to arrive. Once the wire center is retired, the copper is dead — there is no extension.
Cost expectations
A typical dual-path cellular fire alarm communicator installs in a few hours and eliminates two monthly POTS bills that often run $60–$120 per line. Payback is usually under 24 months. Elevator phone service pricing depends on the number of cabs and whether you keep an in-house PBX line or move to a fully managed cellular service.
Don't wait on this one
The 2026 window is not aspirational — carriers are actively discontinuing wire centers today. If your building still has copper POTS on fire alarm or elevator lines, put a project on the calendar now, before the notice arrives.