The POTS Line Sunset: What It Means for Your Business

The POTS line sunset has moved past "carriers are talking about it" to "carriers are doing it." Since the FCC discontinued mandatory POTS service obligations, copper-line phone service in the US has been on an accelerated decommissioning path. Some carriers have hit hard end-dates in specific regions; others are using aggressive pricing to drive customers off copper without formally cutting service. Either way, businesses still depending on POTS lines need a plan, and the timeline is shorter than most businesses realize.

The Regulatory and Market Reality

The FCC's POTS deregulation order in 2022 removed the requirement that carriers maintain the legacy copper telephone network at regulated rates. The order didn't force carriers to stop POTS service — it allowed them to. Carriers have used that flexibility differently. AT&T has been the most public about decommissioning, with explicit end-of-life notices for POTS service in many areas. Verizon, CenturyLink/Lumen, Frontier, and regional carriers have taken varied approaches, but the direction is the same: copper infrastructure is being de-invested, and POTS rates are climbing to encourage migration off the platform.

The practical timeline for any given location varies, but most businesses on POTS lines should plan for sunset within 24-36 months. Some areas have shorter timelines.

What Depends on POTS at Most Businesses

Even businesses that switched their main phone system off POTS years ago typically have residual copper lines doing specific jobs:

• Elevator emergency phones
• Fire alarm communicators (often required by NFPA 72)
• Burglar and intrusion alarm communicators
• Fax lines (often for HIPAA-covered medical records or industry-specific compliance)
• Building entry and access control system phones
• Backup voice service for cellular-dead-zone locations
• Out-of-band management for critical network gear
• Credit card terminals with dial backup

Each of these needs a specific replacement strategy. There's no single replacement that fits all use cases.

The Replacement Strategies

By use case, the modern replacements:

• Elevator phones — cellular-backed VoIP solutions that meet ASME A17.1 (Kings III, AT&T elevator service, others)
• Fire alarm communicators — UL-listed cellular communicators approved by the alarm panel manufacturer (5G-LTE devices from Honeywell, DSC, Telular, others)
• Alarm and access control — cellular communicators from the alarm vendor
• Fax — email-to-fax services or replacement of fax-dependent workflows with secure document portals
• Backup voice — VoIP service with cellular failover, or dedicated cellular voice service
• Out-of-band management — cellular routers with console-server capability
• Credit card backup — wireless terminal or cellular failover for the modern terminal

Why You Should Plan Now, Not Later

Three reasons to start the POTS migration project before the carrier forces the timeline:

First, life-safety equipment (elevator phones, fire alarms) requires certification testing after replacement. Inspectors need to verify the new path works. If you wait until your carrier issues a 90-day disconnect notice, you don't have time to certify replacements; you have time to scramble.

Second, the supply chain for cellular communicators has lead times. During waves of POTS migration in specific markets, businesses have waited months for hardware. Ordering now puts you ahead of the wave.

Third, parallel-run periods are how you catch problems. Running the cellular replacement alongside the POTS line for 30-60 days verifies the new path works reliably before you cut over. You can't do that if the POTS line gets disconnected before the replacement is in place.

What to Do This Quarter

Practical next steps for any business with active POTS lines: inventory every POTS line and identify what each one is doing, request a roadmap or end-of-life statement from your carrier for each circuit, classify each line by replacement category, order replacement hardware for life-safety circuits first, and schedule parallel-run testing before disconnecting the legacy line. If you'd like help running a POTS sunset migration for your business, a conversation with our team can scope the project.