A business landline in 2026 is usually not a copper wire. Most “landline” service sold to businesses today is carrier-hosted VoIP or cable voice delivered under the old name, while true copper POTS is being retired carrier by carrier — AT&T has publicly targeted the end of copper across most of its wireline footprint by 2029 — and repriced upward until customers migrate. If your business still pays for genuine copper lines, the question is no longer whether to replace them, but which replacement path each line takes and how to move the number on your schedule instead of the carrier’s.
SIPNEX is an FCC-licensed carrier on the replacement side of this transition. This is the buyer’s guide we give businesses holding a stack of aging line bills: what a landline even means now, what the copper that remains actually costs, the three replacement paths, and the small set of devices that still need an analog jack.
What a business landline actually is now
Historically, a landline meant POTS — plain old telephone service: a dedicated copper pair from your building to the phone company’s central office, carrying an analog voice signal and its own line power. That architecture is what’s being retired.
What gets sold as a “business landline” today is usually one of three other things wearing the name. Cable companies deliver voice over the same coax as your internet — VoIP terminated at their modem. National providers resell hosted VoIP lines as “digital landline” or “business line” service. And cellular carriers sell fixed wireless line replacements. All of them are line emulation: a dial tone that feels like a landline but rides a packet network underneath.
That distinction matters for buyers. If the “landline” you’re quoted is already VoIP under the hood, you’re choosing between VoIP flavors — so compare them as VoIP, on price, features, and who the underlying carrier is. Our VoIP vs landline comparison breaks down that decision in detail.
What legacy copper costs in 2026
If you hold true copper POTS lines, you’ve watched the invoices climb. There is no official price index for business POTS, but industry sources consistently document business lines that ran $40–65 per month before 2019 now billing $65–120 or more, with legacy-tariff extremes far higher. The direction is deliberate: carriers price copper so that migration looks better at every renewal.
The regulatory backdrop explains why. The FCC’s 2019 forbearance order (FCC 19-72) ended the wholesale obligations that kept copper economically attractive to maintain, and the Commission’s March 2026 modernization order removed most of the remaining procedural friction around retiring it. What survives as your protection is direct written notice — at least 90 days for residential customers, with trade analyses reporting 180 days for business customers. The full filing history, including the myth of a 2022 shutoff deadline, is in our POTS retirement timeline.
The planning takeaway: the gap between a carrier’s decision and your line going away is now roughly the notice period. Treat the notice letter as the end of the runway, not the start of the project.
Replacement path 1: cloud PBX for the phones
If your landlines serve people — reception, office phones, a hunt group behind a main number — the modern replacement is a cloud PBX: the phone system runs in the carrier’s network, your desk phones and mobile apps register to it over your internet connection, and features like auto-attendant, ring groups, voicemail-to-email, and call recording come included rather than per-line.
The economics are the headline. SIPNEX hosted PBX extensions start at $6.99 per month, with the phone system, the lines, and the carrier all coming from one FCC-licensed provider — no separate PBX maintenance contract, no per-feature upselling. For a small office comparing that against a stack of copper line charges, the math usually settles the question before the features do. Our small business PBX guide covers how to size and shortlist.
Replacement path 2: SIP trunks for an existing PBX
If you already own a phone system you like — an on-premises PBX or key system still doing its job — you don’t need to replace it to leave copper. SIP trunking replaces the analog or PRI lines feeding that PBX with a SIP connection over your internet circuit. The phones on desks don’t change; the trunk behind them does.
This is the lower-disruption path for businesses mid-lifecycle on their hardware. Carrier-direct SIP also changes the cost model: per-minute wholesale rates instead of flat per-line charges, unlimited concurrent channels, and published tiers on our pricing page. If the PBX is genuinely at end of life, skip this step and go straight to the cloud PBX path above.
Replacement path 3: POTS in a box, with eyes open
The third path is a cellular appliance — “POTS in a box” — an LTE device with analog jacks and a battery that emulates dial tone for legacy equipment. It genuinely fits a minority of lines: sites without reliable wired internet, and code-bound life-safety lines where a listed cellular device is the accepted path.
Buy it with the caveats in view. Base batteries often don’t meet life-safety standby requirements on their own, so extended-battery packages become mandatory on elevator and alarm lines. Fax and other modem-based devices frequently struggle over compressed cellular voice. And the box is not line-powered the way copper was — everything now depends on the battery and your wall outlet. It’s a niche tool, not the default replacement.
What still needs an analog path
Three categories of equipment kept copper alive long after the office phones could have moved: fax machines, elevator phones, and alarm panels. None of them actually requires copper — they require an analog interface with the right engineering behind it.
Fax runs over SIP through an ATA (analog telephone adapter) using T.38 relay or G.711 pass-through. Elevator phones and fire-alarm communicators are governed by life-safety codes that are technology-neutral but strict about monitoring and standby power — the requirement is the behavior, not the wire. The POTS replacement hub has the line-by-line playbook, and our elevator phone line requirements guide covers the code details. The right move is an audit: inventory every analog line in the building, assign each one a path, and migrate deliberately.
Porting the number: the part you control
Whatever path each line takes, the phone number moves with you. Local number portability is an FCC mandate — your business numbers are yours, not the losing carrier’s. You submit a Letter of Authorization, the gaining carrier handles the port request, and simple ports of one to ten local numbers typically complete in 7 to 14 business days. SIPNEX charges no porting fees and handles the paperwork, FOC scheduling, and cutover; the number porting guide walks through the LOA details and the mismatched-account-info trap that causes most delays.
The strategic point: port before the retirement notice forces your hand. A business that audits its lines and ports on its own schedule chooses its replacement calmly. A business that waits for the 180-day letter negotiates under a deadline.
Frequently asked questions
What counts as a landline today?
Strictly, a landline is a wired phone line — historically copper POTS carrying analog voice with its own line power from the central office. In practice, most “landline” service sold to businesses in 2026 is VoIP or cable voice delivered under the landline name, with the dial tone emulated over a packet network. True copper is the shrinking minority, being retired carrier by carrier and repriced upward while it lasts.
Do businesses still need a landline in 2026?
Businesses need reliable phone numbers and, in a few cases, analog interfaces — not copper itself. Office calling is better served by a cloud PBX or SIP trunks. Fax, elevator phones, and alarm panels need an analog jack, which an ATA on a SIP line or a listed cellular device provides. No current US requirement obligates a business to keep a copper landline; life-safety codes specify behavior, not wire type.
What is the cheapest replacement for a business landline?
For office phones, a cloud PBX is usually the lowest total cost: SIPNEX extensions start at $6.99 per month with features included, versus copper line charges that industry sources document climbing well past their pre-2019 levels. If you already own a working PBX, SIP trunking preserves that investment and replaces only the lines. Compare any “digital landline” quote against these directly — most are VoIP already, plus a markup.
Does my landline number belong to me or the phone company?
It belongs to you in the sense that matters: FCC local number portability rules guarantee your right to move the number to any carrier. The losing carrier can only reject a port for specific valid reasons like mismatched account information. Submit a Letter of Authorization through the gaining carrier, and simple ports complete in 7 to 14 business days — SIPNEX handles the process with no porting fees. Details in the number porting guide.
Do I have to keep one copper line for fax and alarms?
No — with correct engineering, neither device needs copper. Fax moves to SIP through an ATA using T.38 relay or G.711 pass-through. Alarm panels and elevator phones move to code-compliant paths — SIP or listed cellular devices — that meet the monitoring and standby-power rules, which are technology-neutral. What fails is plugging these devices into an ordinary VoIP adapter with no fax or life-safety engineering. The POTS replacement hub maps each device type to its path.
SIPNEX is an FCC-licensed carrier for the far side of the copper sunset: business landline replacement on SIP, cloud PBX extensions from $6.99 per month, numbers ported with no port fees, and A-level STIR/SHAKEN attestation on every outbound call. Talk to an operator or call (833) 665-2220.
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