The Death of Dial Tone as We Know It: How POTS IN A BOX® Keeps Legacy Lines Alive
Direct Answer
“Dial tone” — the signal that has defined telephone service for a century — is disappearing as carriers retire the copper Public Switched Telephone Network (PSTN). But dial-tone access isn’t going away: DataRemote’s POTS IN A BOX® appliances, the 90X1 (5G) and 90X2 (LTE), give legacy analog devices — phones, fax, alarms, modems, M2M — the exact analog interface they expect while carrying that traffic over cellular and IP. Legacy equipment keeps working; only the copper underneath it changes.
Key takeaways
- Dial tone was built on ~100 years of copper PSTN infrastructure that carriers are now retiring.
- The economics of the copper “last mile” have become unsustainable — driving the industry-wide copper retirement.
- AT&T stopped accepting new copper line orders in October 2025 and targets nationwide retirement by 2029; the FCC has cut the copper-retirement notice period to as little as 90 days.
- Legacy analog devices (fax, alarms, modems, SCADA) don’t work on the new infrastructure without a bridge.
- DataRemote’s 90X1 and 90X2 preserve dial-tone access for those devices over cellular/IP — no rip-and-replace.
The death of dial tone
The telecommunications industry has changed with the times, and the way service is provisioned has changed with it. That evolution has led to the death of dial tone as we knew it. To keep existing capability, many users of traditional dial-tone services have been pushed toward potentially expensive equipment changes.
DataRemote developed a different answer: POTS IN A BOX®. The solution provides access to the PSTN without traditional central-office copper wiring — saving legacy-equipment owners from stranded investments. To appreciate the elegance of that fix, it helps to understand how we got here.
Where it all started
It began in 1876, when Alexander Graham Bell received a U.S. patent for the telephone. Bell formed the Bell Company, which became the American Telephone and Telegraph Company (AT&T). Competitors followed, and Local Exchange Carrier (LEC) companies proliferated.
Their technology carried voice in an analog format, and analog telecommunications would reign for a century. These simple lines were called Plain Old Telephone Service (POTS) lines. Collectively, the interconnected exchanges became the Public Switched Telephone Network (PSTN) — and its one common denominator was wire. Enormous quantities of copper were installed worldwide, becoming the pathway for all communications and signaling. The most complex and costly portion to provision and maintain earned its own name: the last mile.
Moving toward the future
Fast-forward 100 years and large-scale wireless communications arrived. By the millennium, cellular was faster, more reliable, and more ubiquitous — and users began moving their PSTN connectivity to wireless. That shift strained the cost model of the regulated LECs, already pressured by competition from cable. Consumers saw POTS rate increases.
The cable industry discovered that transmitting digital signals unlocked additional capacity, dovetailing with the rise of the Wide Area Network (WAN) — the Internet. Voice over Internet Protocol (VoIP) went mainstream, opening yet another path to replace traditional POTS lines. No longer tethered to telephone wire, anyone could communicate wirelessly or over IP. These forces together produced the “death of dial tone.”
AT&T, Verizon, and other LECs petitioned the FCC, state regulators, and legislatures for permission to retire wired PSTN connections in favor of wireless and VoIP. In 2019, the FCC granted significant relief from legacy copper obligations in its forbearance order (FCC 19-72A1), accelerating the decline of wired PSTN access. Since then the pace has only quickened:
| Milestone | Status |
|---|---|
| FCC forbearance from legacy copper obligations | Granted 2019 |
| AT&T stops accepting new copper line orders | October 2025 |
| FCC copper-retirement notice period | Cut to as little as 90 days |
| AT&T target for nationwide copper retirement | 2029 |
The economics of maintaining the last mile have become overwhelming, and most LECs are exiting traditional copper analog dial-tone service.
The paradigm shift — and its cost
The paradigm shift has happened, but not without consequences. Modems, fax machines, alarm signaling, and certain analog Command-and-Control (SCADA) systems were built for dial tone. As copper is retired, this legacy equipment can simply stop functioning — leaving owners facing potentially costly replacement as the apparent only option.
DataRemote’s POTS IN A BOX® provides a transparent bridge for any legacy device that used traditional analog dial tone to keep reaching the PSTN. It eliminates the need to swap out analog equipment just because the LEC eliminated wired dial-tone lines. Legacy equipment doesn’t become a stranded investment — instead, PSTN access is assured.
How it works
POTS IN A BOX® uses available cellular data or WAN networks to transmit signals from connected analog devices over highly secure digital connections, with a specialized series of network servers completing the connection to the PSTN. The result is a legacy analog system that continues to function as originally installed, with two-way service through the PSTN. The appliances add local router connectivity for simultaneous LAN devices, multiple-line capability, dual-carrier functionality, and an onboard standby battery as standard.
The solution enables legacy analog wireline in-band voice, Machine-to-Machine (M2M) data, DTMF signaling tones, analog modem tones (FSK and PSK), fax, and alarm signals to be carried over LTE/5G cellular data networks or other WAN facilities.
The devices that keep dial tone alive today
Where earlier generations of POTS IN A BOX® hardware carried this mission, DataRemote’s current appliances are the 90X1 and 90X2:
| 90X1 | 90X2 | |
|---|---|---|
| Network | 5G with LTE failover | LTE (bands 2/4/5/12/13/14/66/71) |
| Analog lines | Up to 8 × RJ-11 FXS | Up to 8 × RJ-11 FXS |
| Battery backup | Up to 48 hours | Up to 48 hours |
| Power output | UPS output for approved devices | Patented UPS output |
| Carrier certification | Verizon, AT&T, T-Mobile | AT&T, Verizon, T-Mobile, FirstNet |
Both preserve the analog behaviors legacy equipment needs, add centralized management through Ara, and are managed end-to-end rather than left to a passive line that can fail silently.
Dial tone lives on
Traditional dial tone as we knew it is passing into history — but dial-tone access is still assured for those who need it. With DataRemote’s 90X1 and 90X2, POTS lines remain easily available long after the copper is gone.
For more on the transition, see the end of copper phone lines and what leaders should do next, POTS IN A BOX®: the modern alternative to copper phone lines, copper retirement across the telecom industry, and what AT&T’s copper retirement means for you. When you’re ready to plan, contact our team.
Frequently Asked Questions
Dial tone is the signal delivered over the copper Public Switched Telephone Network (PSTN) that told a phone the line was ready. Carriers are retiring the underlying copper because it's expensive to maintain, increasingly unreliable, and being displaced by wireless and IP networks. The FCC has cleared the way, and AT&T is targeting retirement of most copper operations by 2029.
There's no single national off-date, but the trajectory is clear: AT&T stopped accepting new copper line orders in October 2025 and targets nationwide copper retirement by 2029, and the FCC has shortened the copper-retirement notice period to as little as 90 days. Individual wire centers are being retired on a rolling basis, so many businesses will get a shutdown notice well before 2029.
Those analog devices were built to work over a traditional dial-tone line. Without a replacement, they can stop functioning when copper is retired. DataRemote's POTS IN A BOX® gives them the same analog interface they expect while carrying the traffic over cellular and IP, so you avoid replacing the equipment itself.
The 90X1 (5G with LTE failover) and the 90X2 (LTE) are DataRemote's current POTS IN A BOX® appliances. Each replaces up to 8 analog lines, includes up to 48-hour battery backup and UPS power output, and supports voice, fax, DTMF, modem/M2M, and alarm signaling.
Facing the end of your dial-tone line?
Talk to DataRemote about replacing copper with a 90X1 or 90X2 POTS IN A BOX®.
