The Complete Guide to POTS Line Replacement in 2026

If you’re responsible for keeping a building’s phones, alarms, or elevators connected, “POTS line replacement” has probably moved from a someday project to an urgent one. This guide explains what’s happening and how to replace POTS lines without breaking the devices that depend on them.

What is a POTS line?

POTS stands for Plain Old Telephone Service — the traditional analog telephone line delivered over copper wire. For decades it was the universal interface for anything that needed to make or receive a call: desk phones, fax machines, fire and burglar alarm panels, elevator emergency phones, point-of-sale terminals, ATMs, and modems.

POTS lines are valued for their simplicity and reliability — line power, a dial tone, and predictable analog signaling. That same simplicity is why so many critical devices were built to depend on them.

Why POTS lines are being retired

Carriers are decommissioning copper because it’s expensive to maintain and the FCC has cleared a faster path to do so. In 2025, the FCC cut the copper-retirement notice period from 180 to 90 days, and AT&T stopped taking new copper orders. As maintenance winds down, prices for remaining lines have spiked — sometimes past $2,700 per line per month.

For a deeper look at the regulatory timeline, see our post on FCC 2025 copper retirement.

POTS replacement options

There are a few common paths off copper:

• Hosted VoIP / SIP — great for office phones, but typically not designed for alarm panels, ring-down, or fax.
• Fiber or wired broadband — depends on availability and still leaves analog devices needing an adapter.
• Managed cellular POTS replacement (POTS IN A BOX®) — purpose-built to carry analog signaling over 5G/LTE while preserving the behaviors life-safety devices require.

For mission-critical and life-safety endpoints, the third option is usually the safest, because it keeps the analog interface intact.

How POTS IN A BOX® works

DataRemote’s appliances act as a drop-in replacement for the copper line:

1. Your analog device plugs into an RJ-11 FXS port on the appliance — no rewiring.
2. The appliance converts the analog signal and carries it over a managed cellular (5G/LTE) connection, with optional wired backhaul.
3. A firewalled network routes traffic to and from the phone network, enabling call origination and completion.
4. Battery backup and automatic failover keep the line up during power and internet outages.
5. E-911 with geo-location and analog behaviors — DTMF, line seizure, supervision, ring-down — are preserved.

Because the analog interface is unchanged, devices behave exactly as they did on copper.

What to look for in a solution

• Preserves analog signaling (DTMF, line seizure, supervision, ring-down, fax)
• E-911 support with geo-location
• Battery backup sized to your outage risk
• Automatic cellular failover and carrier certifications
• Centralized management with line-status monitoring and alerts
• Compliant hardware — NDAA §889 and TAA

Cost: what to expect

Most organizations move from escalating per-line copper charges to a predictable managed plan, often realizing savings of up to 50% while gaining battery backup, failover and monitoring they didn’t have before.

Getting started

Start by inventorying your lines and identifying life-safety obligations, then match each endpoint to the right appliance. DataRemote offers a range of POTS IN A BOX® appliances from a compact 2-line unit to high-capacity 8-line models. For a plain-English primer on the hardware, see POTS IN A BOX®: the modern alternative to copper phone lines. Contact us and we’ll help you scope the migration.