Mitel end of life: alternatives and how to migrate

Is Mitel reaching end of life?

Mitel has been a mainstay of UK business telephony for years, and its on-premise systems have a strong reputation for doing the job reliably. The question in 2026 is about product lifecycles, not whether the kit was any good.

Based on publicly available information as of June 2026, Mitel has published end of life timelines for certain on-premise platforms. Reporting indicates that some products reached end of design support around the end of 2025, meaning no further operating system updates or security patches from that point, with full end of support scheduled for later years; confirm the exact dates and product scope with Mitel for your system. Mitel continues to operate and offers newer on-premise and cloud options for customers who want to stay with the brand.

As with any vendor, do not act on a general headline. Check the exact end of design support and end of support dates for your specific Mitel model and version, directly with Mitel or your maintenance partner. The point that matters is the security one: once a platform stops receiving updates and patches, running it unchanged leaves it more exposed over time, which is why many businesses use this as the trigger to plan a move.

Your options when Mitel reaches end of support

Reaching end of support does not mean your phones stop working tomorrow, but it does mean a decision is due. There are three broad routes, suited to different situations.

1. Extended or third-party maintenance. Specialist firms can keep an out-of-support Mitel system running for a while. This buys time but leaves you without manufacturer security updates and still tied to lines that are being switched off.
2. Move to a newer Mitel platform. Staying with the vendor is a valid choice, particularly for larger or heavily integrated estates. For most small and medium UK businesses, a fresh on-premise purchase is a significant spend on technology the 2027 deadline pushes towards the internet regardless.
3. Migrate to a cloud phone system. Move the whole phone system to a hosted service reached through apps and IP phones. This is the route most UK SMBs now take. It ends the hardware and maintenance burden and is ready for the switch-off from day one.

These can be combined. A common approach is short-term third-party maintenance to keep things stable while a cloud migration is planned and run in parallel, so service never drops.

Why businesses move to the cloud, not like-for-like

It is tempting to replace an ageing system with a newer version of the same thing. For most UK businesses in 2026 that is not the smartest move, and the reason is the 31 January 2027 PSTN and ISDN switch-off. The traditional lines that on-premise systems rely on are being retired across the UK, so buying new on-site hardware that still needs those lines is investing in a foundation that is being removed.

Cloud avoids that because it runs over your internet connection. It also changes the cost shape. Rather than a large upfront purchase plus a maintenance contract, you pay a per-user monthly fee, typically £7 to £30 per user per month across the UK market, with no hardware to own and updates handled for you. And it matches modern working: the same number rings on a desk phone, a mobile app and a browser, so staff stay reachable in the office, at home or on the road. Features that needed extra Mitel hardware or licences, such as call recording, queues and IVR menus, become software settings, and modern platforms layer on call transcription, AI summaries and AI receptionists.

What to look for in a Mitel replacement

Having decided to move to the cloud, the choice is which provider. Judge them on neutral, practical criteria rather than brand. This checklist covers what matters for a UK business leaving an on-premise Mitel system.

What to check	Why it matters
UK calls inclusive	Avoid surprise per-minute charges; confirm UK landline and mobile minutes are bundled.
Number porting	You must be able to keep your existing geographic, 03 and 0800 numbers, ideally free.
Apps and devices	Mobile app, browser softphone and desk phone support, so each person uses what suits them.
Full PBX features	Auto-attendant, ring groups, call queues, business-hours routing and voicemail-to-email built in.
AI options	Call recording, AI transcription and an AI receptionist that can answer and route calls 24/7.
UK-based support	Local support that understands UK numbering, porting and the switch-off.
Contract length	Shorter, clearer terms give you flexibility; check what you are committing to.
Switch-off readiness	The system should run fully over the internet with no dependence on PSTN or ISDN.

Voxora fits this as a UK cloud option with full PBX features, free number porting, mobile, browser and desk phone apps, an AI Receptionist that answers and routes calls 24/7, and a reseller model for agencies and MSPs. Compare it alongside other UK providers on the criteria above.

How to migrate from Mitel and keep your numbers

Migrating from Mitel to the cloud follows the same low-risk pattern as any on-premise to cloud move. Assess your current lines, numbers, users and any connected devices such as alarms, lifts or door entry. Choose a provider and plan. Build your users, menus and call routing in the new system while Mitel is still live. Start the number port, which the new provider manages while your old lines stay active, so there is no gap. Run both systems in parallel for a week or two, test thoroughly, then switch over and retire the Mitel hardware and its maintenance contract.

Your numbers come with you. Porting keeps your existing geographic, 03 and 0800 numbers and is usually free, typically completing in a few working days to around two weeks depending on the number type and the losing provider. On handsets, some IP phones can be re-provisioned to a new cloud system over SIP, while older Mitel-tied phones generally need replacing with IP phones, the mobile app or a browser softphone. Ask the new provider to check your exact phones upfront so you know whether to keep or replace them.