Free equipment audit · Updated September 2026

Will your business equipment work on a digital landline?

Select everything that may use your telephone line. This checker builds a practical supplier and testing list for the move from PSTN or ISDN to digital services. It does not send or save your answers.

Do not test safety-critical equipment by guessing. GOV.UK advises businesses to identify every line-dependent device and confirm compatibility with its supplier or manufacturer.

1. What is connected, or may be connected, to the line?

Choose every item that applies, including equipment in cupboards, plant rooms and lifts.

Analogue phones or extension wiring Fire, security or monitored alarm Lift or emergency telephone Card terminal, till or EPOS Fax, franking machine or modem Door entry, gate, CCTV or intercom PBX, switchboard, ISDN or multiple lines Unknown device or unexplained socket

2. Does broadband share the telephone line or account?

Yes No Not sure

3. Must calls or connected equipment keep working during a power or broadband failure?

Yes No Not sure

4. Is reliable mobile signal available throughout the premises?

Yes No Not sure

What this checker can and cannot tell you

A connector or analogue telephone adaptor may let some older equipment attach to a digital service, but connection is not proof that signalling, monitoring or power-failure behaviour is safe. The equipment supplier and communications provider must confirm the supported design, and you should test the complete service after migration.

Provider rules also differ. For example, BT Business currently says a number cannot be ported to its Digital Voice for Business service from a line that supports broadband, or from certain lines supporting alarms, lifts and fax machines. Check the rules for your exact old and new services before changing or cancelling anything.

A service to include in your comparison

Advertisement · Clear Comms receives 15% of charges from customers referred to SOHO66. Compare compatibility, resilience, porting and total cost with other providers before buying.

View SOHO66 business phone options

Primary sources

GOV.UK: Moving landlines to digital technologies, published 28 May 2025.
GOV.UK: Telecommunications Modernisation Connectivity Timeline, including the 31 January 2027 Openreach PSTN migration date.
Ofcom: Your landline is going digital, updated 26 August 2026.
BT Business: Porting or transferring to Digital Voice for Business.

General information only. The result cannot confirm that a particular device, number or service is compatible or portable.