Business Landline Switch-Off Checklist (Step by Step)

Quick answer

Work through it in this order: give it an owner, audit every line and what it does, phone your alarm, lift and telecare suppliers in week one because their diaries decide your timeline, order connectivity, choose the voice replacement, plan the number porting, sort power resilience, then cut over, test everything and only then cease the old lines. The phone part is quick. The parts that depend on other people's engineers are what determine whether this is routine or painful.

The switch-off is one of those jobs that is easy to keep putting off - until prices rise or the deadline looms. Both have now happened. This checklist breaks the move into clear, ordered steps so you can switch off your analogue lines calmly and on your own terms, with nothing left behind. Print it, assign the owner, and work down it.

Why act now

The analogue network switches off on 31 January 2027. You cannot order new analogue lines - the national stop-sell took effect in September 2023 - and legacy line rental rose in three steps through 2026, roughly doubling.

From August 2026 that leaves around five and a half months, and the working time is shorter. Take out Christmas and the new year, allow lead times of two to six weeks on connectivity and four to twelve weeks on alarm and lift work, and a business starting now has a comfortable runway. A business starting in November does not. Our switch-off deadline guide sets out the arithmetic in full.

Step 0: Give it an owner and a date

Skipped by almost everyone, and it is the step that makes the rest work.

• Name one person responsible, with authority to approve orders and to say "not yet" to a line cease.
• Put a target completion date in the calendar - aim for November 2026, not January 2027.
• Create one shared line inventory document that everything else refers back to.
• Agree who signs off that a device has been proven working before its old line goes.

Step 1: Audit what you have

You cannot plan a move until you know what is connected. Pull three months of bills, list every standing charge, then walk the building.

Record for each line:

• Every phone line and number, including any DDI ranges.
• Whether you are on analogue or ISDN, and how many channels.
• All non-phone devices on the lines - see devices that rely on phone lines.
• Anything you cannot identify, marked as unknown rather than assumed spare.
• Lines you can cancel immediately because nothing uses them.

That last line often pays for a chunk of the project on its own. To map each line to its replacement, use analogue line replacement options.

Step 2: Make the long-lead phone calls this week

This is the step that belongs second, not last, and getting it wrong is the main reason migrations turn into scrambles. All of these depend on third-party engineers whose availability is finite and shrinking.

• Alarm company - what does the panel signal over, and what is the IP replacement? See alarm systems and the switch-off.
• Lift maintenance company - and ask specifically for a mobile signal survey at the unit's location. See lift emergency lines.
• Telecare or nurse call supplier, if you have one - never adapt analogue telecare onto a digital line. See care settings.
• Fire alarm maintainer, if monitoring is separate from the intruder alarm.
• Card payment provider - does the terminal dial out? See card machines.
• Door entry installer and anyone maintaining telemetry or plant alarms.

Make all of these in the same week rather than in sequence. They run in parallel, and the longest one governs your timeline.

Step 3: Check and order your connectivity

Your replacement runs over the internet, so confirm the connection is up to it - and order early, because this is on the critical path.

• Is full fibre available, or do you need SoGEA? See SoGEA vs FTTP.
• Is there enough upload headroom for concurrent calls alongside everything else? See internet speed for VoIP.
• Do you need 4G/5G failover, now that phones, alarm signalling and card payments may share one connection?
• If any site needs a leased line, order it immediately - lead times run to several months.
• Is voice traffic prioritisation configured on the router?

Step 4: Choose your replacement

Match your needs to an option from business landline alternatives:

• Single simple line? A Digital Voice line.
• A team or call handling? A hosted phone system.
• Keeping a capable existing PBX? SIP trunks - see can you keep your existing phone system.
• Size on peak simultaneous calls, not headcount - see lines and channels.
• Get mid-term price increases in writing, in pounds and pence.

Sanity-check the budget against our cost guide and what the switch-off costs. If you would rather have this priced properly for your setup, get a no-obligation quote.

Step 5: Plan number porting

Your numbers are the most valuable thing here - protect them.

• Confirm every number and DDI range is included in the port.
• Check the account name and address match the losing provider's records exactly, or the port will be rejected.
• Agree a port date, allowing two to four weeks from order.
• Confirm whether porting is charged per number or per block on large ranges.
• Never cease the old line first. See keeping your landline number.

Step 6: Sort resilience and devices

• Fit battery backup (UPS) on the router and network kit, sized for a realistic outage.
• Configure automatic divert to mobiles for when the connection drops - see landline resilience.
• Confirm alarm, lift and telecare work is scheduled and will be commissioned before any cease.
• Get written confirmation from each specialist that their equipment is tested and re-registered.
• Update your business continuity plan to reflect that signalling now depends on power and connectivity.

Step 7: Cut over, test, then cease

• Test calls in and out on every number.
• Test DDIs, hunt groups, out-of-hours routing and voicemail.
• Test transfer, hold and call quality during a busy period, not at 8am.
• Trigger each device end to end - alarm to monitoring centre, lift phone to whoever answers, a live card transaction.
• Confirm the power-cut plan works by actually unplugging the router.
• Run both services in parallel briefly where you can.
• Only then cease the old analogue and ISDN lines - and check the next bill to confirm the charges have actually stopped.

That final check is the one people miss. Ceasing a line is a request, not an event, and duplicate charges running for months is the commonest way a well-run migration still loses money.

Working timeline back from the deadline

The five things most often forgotten

1. Non-phone devices - especially at the site nobody visits often.
2. Porting before ceasing - the one irreversible mistake in the whole exercise.
3. The power-cut plan - decided, but never actually tested.
4. Ceasing the old lines and confirming the charges stopped.
5. Telling your insurer once alarm signalling has changed.

The bottom line

The switch-off is very manageable when treated as a short, ordered project: assign an owner, audit, make the specialist calls in week one, order connectivity, choose, port, sort resilience, then test and cease. Do it early and you save money and avoid the rush - and aim to finish in November, so January is contingency rather than crisis.

Want a guided switch with nothing missed? Get a no-obligation quote or call 0333 006 9399 and we will run the audit first.

Getting unknown calls on a business line? Our free UK phone number checker shows which network or provider Ofcom allocated any number to, and whether the range is in service — no sign-up.