PSTN and ISDN switch-off help

Traditional phone lines are being switched off on 31 January 2027. If your Gloucestershire business still relies on PSTN or ISDN, now is the time to plan — calmly, and without a hard sell.

What the switch-off means

BT Openreach is retiring the old copper telephone network. After 31 January 2027, new and existing PSTN and ISDN services won’t be supported in the same way. Most small businesses will move to a cloud phone system, SIP trunks on an existing PBX, or both.

You can usually keep your existing numbers by porting them. Typical port timescales are about 4 days for a single PSTN line and about 22 days for ISDN (typical estimates, not guarantees).

See how switching and porting works →

Common paths off PSTN / ISDN

Cloud phone system

Replace the old lines and handsets setup with a Cloud PBX and softphones or new desk phones.

SIP trunks

Keep a compatible on-site phone system (for example certain Panasonic or Avaya IP Office setups) and replace the ISDN/PSTN circuits.

Teams calling

Take business calls in Microsoft Teams with Direct Routing, if that’s how your team already works.

Talk it through

Based in Gloucestershire, serving local businesses. Call freephone 0800 058 1222 (Mon–Fri, 9am–5pm) or request a quote.