Not Everything Needs the Cloud: The Business Case for Keeping One Analogue Line

Speak to most telecoms providers — ourselves included, on most days — and you will hear a familiar message: migrate everything to VoIP, retire the copper, and do it before the PSTN switch-off catches you out. That advice is sound for the vast majority of UK SMEs. But it is not universally sound, and pretending otherwise does businesses a disservice.

There is a small but legitimate set of circumstances where retaining an analogue line is not merely defensible but actively recommended. Understanding them could save you an expensive and unnecessary retrofit.

The Exceptions BT Itself Acknowledges

The most compelling argument for keeping a copper line in select cases comes from the network operator retiring the wider network. Openreach and the major providers have acknowledged that certain services are exempt from the standard switchover programme, chiefly because no like-for-like digital replacement exists that meets the same safety or resilience requirements.

The categories most commonly cited include:

• Lift emergency lines. Disabled passengers trapped in a lift need a line that works during a power cut, without depending on a router or local mains supply.
• Alarm and monitoring lines. Intruder alarms, fire panels, and some telecare devices have historically relied on analogue signalling, and not all have certified digital equivalents.
• CCTV and remote telemetry in certain configurations.
• Some EPOS and payment terminals, particularly older units that were never designed to share a broadband connection.

If your premises contain any of the above, the correct first step is not to rip out the line but to verify its status with your provider and the equipment manufacturer.

When 'Go Digital' Is the Wrong Advice

Consider a small shop in Sheffield with a fire alarm panel installed in 2015. Its signalling protocol is analogue by design. Forcing it onto an ATAs (analogue telephone adapter) or a consumer VoIP service may technically produce a dial tone, but it may also silently break the monitoring centre's ability to receive alarm signals — a failure nobody notices until the night it matters.

Or take a three-storey office with a passenger lift. Under LOLER regulations, the lift's emergency communication must remain usable in a power failure. A VoIP solution depends on local power for the router; a well-specified analogue line, or a properly engineered digital replacement with battery backup, does not compromise that requirement.

In these cases, blanket 'migrate everything' advice is not just inconvenient — it can create a compliance risk.

The 2027 Deadline Still Applies — Mostly

Here is where careful planning matters. The full PSTN withdrawal is scheduled to complete by the end of January 2027, and exemptions are not indefinite carve-outs. They are, in most cases, transitional arrangements or narrowly scoped exceptions with their own engineering conditions.

A pragmatic hybrid approach for an SME looks like this:

1. Audit every line and what it feeds. Lines used for voice calls are almost always candidates for VoIP migration. Lines feeding lift alarms, fire panels, or monitoring devices need individual assessment.
2. Contact the equipment manufacturer or maintainer. Ask specifically whether the device is approved for operation over a digital (FTTP or VoIP) connection, and under what conditions.
3. Migrate the voice lines now. Do not let easily-migrated traffic delay your switchover because of one stubborn alarm panel.
4. Document the exemption case for what remains. If you retain an analogue line for a lift, keep written evidence of why — it will matter at renewal, at audit, and if the line is ever questioned.
5. Diary the review. Exemption criteria are evolving. What requires copper today may have a certified digital alternative in eighteen months.

The Hybrid Setup Done Properly

For businesses in the exempt category, the end state is usually a small number of analogue lines retained for life-safety and monitoring purposes, alongside a modern VoIP or hosted telephony service for everything else. The two coexist comfortably: your team makes and receives calls over the cloud system, while the lift phone and alarm panel quietly carry on as they always have.

The mistake to avoid is the opposite extreme — deferring your entire migration because one device cannot yet move. That approach trades a manageable, well-understood exception for the very real risk of losing all service when the copper network is finally withdrawn in your area.

A Note on Honest Advice

We spend most of our working days helping businesses leave the PSTN behind, and we believe firmly that for the majority of SMEs, VoIP delivers better resilience, better features and better value. But we would rather tell you the truth about the exceptions than sell you a migration that breaks your fire alarm.

If you are unsure which side of the line your business falls on, an audit of your existing lines — what they do, not just what they cost — is the sensible starting point. For most, it will confirm the migration plan. For a few, it will identify the one line worth keeping, and the paperwork to justify keeping it.