Replacing ISDN or analogue lines: how to move your business phones to VoIP

To replace ISDN or analogue lines, move your calls to a VoIP phone system that runs over your broadband. The key steps are: audit your lines and numbers, make sure your internet connection is up to the job, choose a system, port your existing numbers, then cancel the old lines only after the move is complete. AVAIO’s 3CX VoIP system costs £14 per user per month + VAT, with no contracts and your numbers kept.

PSTN switch-off: what happens to alarms, lifts, card machines and fax?

When the UK’s copper phone network closes on 31 January 2027, any device that still dials out over a traditional phone line may stop working. That includes intruder and fire alarm diallers, lift emergency phones, older card machines, franking machines, fax machines and door entry systems. Each one needs moving to an internet (IP) or mobile (4G) connection before the deadline. Start with a simple audit of every line and what is plugged into it.

What internet speed do I need for VoIP?

Each VoIP call uses roughly 100 kbps (0.1 Mbps) in each direction. So 10 people on calls at the same time need about 1 Mbps of upload and download just for voice. In practice, the bigger factors are upload speed, a stable connection and low latency – which is why full fibre or a leased line gives the best results for busy offices.

How much does a business VoIP phone system cost in the UK?

Business VoIP in the UK typically costs £7 to £30 per user per month, depending on the features and call bundles included. Desk phones are optional, as most systems include mobile and desktop apps. AVAIO’s 3CX VoIP phone system costs £14 per user per month + VAT, with no contracts and no set-up fees.

What is VoIP? A plain-English guide for UK businesses

VoIP (Voice over Internet Protocol) is a phone system that makes and receives calls over your internet connection instead of a traditional copper phone line. You keep your existing numbers and can answer calls on a desk phone, a computer or a mobile app – in the office or anywhere else. With the UK’s old phone network closing on 31 January 2027, VoIP is becoming the standard for UK businesses.