Traditional ISDN and PSTN phone lines are being switched off in 2027. Replace them now with a modern VoIP business phone line — better features, lower cost, ready for the future.
BT is switching off the PSTN and ISDN network in 2027. Every UK business landline running on copper will be disconnected. You need to migrate to VoIP before then.
⚠️ PSTN Switch-Off Deadline: December 2027
If your business uses analogue phone lines, ISDN2 or ISDN30, they will stop working. Telexico migrates your numbers and replaces the system before the deadline — at no disruption to your business.
VoIP business lines cost significantly less than ISDN. Unlimited UK calls included in monthly price.
Port your existing 0121, 0131 or any geographic number to the new VoIP system. Customers see the same number.
Desk phones, mobile app, desktop softphone. Your business number works wherever your team works.
Incoming calls answered by AI, routed intelligently, messages taken when you're unavailable.
GDPR-compliant call recording for compliance, training and dispute resolution. Cloud stored.
VoIP lines work with SIP-compatible phones. Or use the free mobile and desktop apps — no hardware needed.
| Old Technology | Modern Replacement | Benefit |
|---|---|---|
| ISDN2 (2 channels) | Hosted VoIP (2+ users) | More features, lower cost |
| ISDN30 (30 channels) | SIP Trunks or Hosted VoIP | Unlimited scalability |
| Analogue landline | VoIP line via app or IP phone | Works over broadband |
| DECT cordless office phone | WiFi-enabled SIP phone | Same experience, modern tech |
| PBX on-site box | Hosted cloud PBX | No hardware, no maintenance |
1–5 users
5–20 users
20+ users
Yes. Telexico ports your existing number to the new VoIP system. Your customers keep calling the same number — they won't notice any change.
With VoIP, you don't buy "lines" like ISDN — you buy user licences. Each user can make and receive calls simultaneously. The system scales automatically.
Calls automatically divert to mobile numbers or the Telexico Assure X 4G backup keeps the broadband running. You won't miss calls.
Yes. Telexico provides any UK area code — 0121 (Birmingham), 0207 (London), 0161 (Manchester) etc. — plus 0800 freephone and 03 non-geographic numbers.
VoIP business lines from Telexico start at £15/user/month including unlimited UK calls. Compare this to ISDN which typically costs £40–£80/line plus per-minute call charges.
Free migration assessment. We handle number porting, installation and staff training. Zero downtime.