AT&T’s Grandfathering of TDM Services: What It Means for Government Agencies — and Why POTS Link is theDefinitive Solution
Introduction: Understanding the AT&T Letter
In late August 2025, RCN Technologies got it’s hands on an important notice from AT&T. This letter formally announced that beginning October 15, 2025, AT&T will “grandfather” TDM-based Local Exchange Carrier (LEC) services in 1,711 wire centers across 19 states. For government agencies that still depend on legacy copper lines for critical applications—such as fire alarms, elevators, blue light emergency phones, and security systems—this development represents a direct and urgent impact.
Defining the POTS Sunset
The “POTS Sunset” refers to the nationwide retirement of Plain Old Telephone Service (POTS). This transition is not optional FCC Order 19-72A1 officially removed incumbent carriers’ obligations to maintain copper networks. Major carriers like AT&T are therefore shutting down service in phases, beginning with grandfathering (ending new adds, moves, and changes) before moving to full decommissioning.
For public-sector entities, the POTS Sunset raises critical concerns:
- Compliance: Systems tied to copper must meet NFPA 72, ASME A17.1, and UL standards even after migration.
- Continuity: Public safety and life-safety systems (fire, security, elevator, 911) cannot tolerate downtime.
- Procurement: Agencies need compliant, contract-ready alternatives that can be
acquired quickly under existing vehicles.
- Procurement: Agencies need compliant, contract-ready alternatives that can be
Explaining the Letter
The AT&T notice explicitly states that as of October 15, 2025, AT&T will no longer accept new orders, adds, moves, or changes for TDM-based services in the affected wire centers. This includes ISDN-PRI, business/residential voice lines, remote call forwarding, and other Local Wholesale Complete (LWC) services.
In short: if an agency relies on copper lines in one of these wire centers, no changes can be made after October 15, and eventual service elimination will follow.
Wire Centers Impacted by State
The scale of this announcement is significant. Below is the state-by-state breakdown of wire centers where AT&T is beginning the POTS Sunset:
- Texas: 271
- Florida: 147
- Illinois: 123
- Georgia: 106
- Michigan: 105
- Louisiana: 103
- Ohio: 111
- Alabama: 90
- Tennessee: 93
- North Carolina: 97
- South Carolina: 65
- Mississippi: 71
- Missouri: 57
- Kentucky: 56
- Indiana: 56
- Wisconsin: 59
- Oklahoma: 40
- Arkansas: 37
- Kansas: 24
In total: 1,711 wire centers across 19 states
POTS Link: The Definitive Government-Ready Solution
For agencies facing the POTS Sunset, POTS Link stands apart as the definitive replacement solution, designed from the ground up to meet government requirements for safety, compliance, and procurement.
1) Standards-Based Architecture (GSA EIS, Section 5 & 6):
POTS Link fully aligns with federal GSA EIS guidance for POTS replacement, including Advanced E911 capabilities and resilient solution architecture.
2) Code Compliance (NFPA, UL, ASME):
Tested against NFPA 72 fire code, ASME A17.1 elevator code, UL 681/864 security standards, and more—POTS Link ensures public safety applications remain fully compliant.
3) Procurement Compliance:
Available under GSA Schedule 70, OMNIA Partners, Sourcewell, NASPO, Equalis Group, and multiple state contracts (GA, PA, and more pending), agencies can procure POTS Link quickly and within budget.
4) Deployment & Management:
Delivered as a fully managed service, POTS Link simplifies the transition. From contract signing through installation, monitoring, and 24/7 NOC support, government agencies benefit from end-to-end oversight.
Conclusion
The AT&T announcement is not an isolated event—it is part of a national shift away from copper. For government agencies, waiting is no longer an option. With 1,711 wire centers impacted across 19 states, agencies must act decisively to ensure compliance, continuity, and safety.
POTS Link provides the most secure, compliant, and government-ready solution available today.
🏢 About RCN Technologies
RCN Technologies partners with over 1,100 unique government agencies across local, state, education, and federal sectors. We specialize in delivering turnkey wireless connectivity where wired options fall short — and we have the public sector procurement experience to help you find an approved purchasing path fast.
By: Reed Perryman — VP of Sales & Marketing, RCN Technologies
Reed Perryman is VP of Sales & Marketing at RCN Technologies with 10 years of experience in POTS line replacement for government agencies, K–12 school districts, and critical infrastructure. He specializes in POTS replacement strategy, GSA procurement, NFPA 72 compliance, and the FCC copper retirement framework.
Checklists & FAQs
AT&T TDM Grandfathering Response Checklist for Government Agencies
| AT&T TDM Grandfathering Response Checklist for Government Agencies | |
|---|---|
| Identify all AT&T TDM/POTS lines in your inventory | Pull billing records and service agreements — flag every line billed under legacy TDM, POTS, or analog service |
| Check for AT&T grandfathering or discontinuation notices | Review all carrier correspondence for service change notices, rate increase letters, or line discontinuation warnings |
| Confirm affected sites and line functions | Map each AT&T TDM line to its physical location and connected device — fire alarms, elevators, fax, security |
| Assess urgency by site and line type | Prioritize life-safety lines (fire, elevator) for immediate replacement — schedule lower-risk lines in subsequent waves |
| Evaluate replacement options before copper ends | Compare managed cellular POTS replacement against VoIP-based alternatives for each line type and use case |
| Engage a managed service provider for a transition plan | Request a no-cost audit and migration timeline from a certified POTS replacement provider |
| Notify relevant departments and stakeholders | Alert facilities, IT, finance, and safety teams of the upcoming copper retirement timeline and replacement plan |
| Execute replacement before grandfathering deadline | Do not wait for AT&T to force disconnection — proactive replacement avoids service interruption and emergency procurement |
Frequently Asked Questions
What does AT&T’s grandfathering of TDM services mean for government agencies?
When AT&T grandfathers a TDM service, it means no new customers can add that service and existing customers are placed on a path to eventual discontinuation. For government agencies, this means POTS and legacy analog lines on AT&T’s network will eventually lose support — and waiting until forced migration creates emergency procurement situations, potential service outages, and compliance risk for life-safety systems.
Is AT&T the only carrier grandfathering TDM services?
No. While AT&T is among the most prominent, other major carriers including Lumen (CenturyLink), Windstream, and regional carriers are also phasing out legacy copper TDM services. Government agencies should audit all carrier relationships — not just AT&T — to identify every line at risk of discontinuation.
How much notice will AT&T give before disconnecting grandfathered TDM lines?
FCC rules require carriers to provide advance notice before retiring copper infrastructure, but the notice period varies and is not always sufficient for government procurement cycles. Some agencies have received 12-month notices; others have experienced shorter timelines. Do not wait for a disconnection notice — begin migration planning now.
Why is POTS Link described as the definitive solution for AT&T TDM replacement?
POTS Link by RCN Technologies delivers a direct dial-tone equivalent replacement for AT&T TDM lines using 4G LTE and 5G cellular networks. It works with existing analog devices — no equipment replacement required — and is deployed as a fully managed service with SLA-backed uptime. Government agencies can procure POTS Link through existing contract vehicles for fast, compliant migration.
Speak with a POTS Replacement Specialist
ADDITIONAL POTS REPLACEMENT RESOURCES
Use these resources to deepen your understanding of POTS modernization.
POTS Link Risk Assessment
Uncover hidden costs, risks & inefficiencies in your POTS setup with our 3-min, 15-question VLE Score assessment.
Code Compliant Replacement Bible
Discover how to replace POTS lines without violations or downtime. Get code compliance tips for NFPA 72, ASME A17.1, ADA, and more — free guide.
GSA EIS Guide
Many public sector organizations continue to use POTS for life safety, compliance, and facility management functions—but without a migration strategy, thes…
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